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bold="true" family="Times New Roman" italic="false" style="_cstyle270" underline="false">Optimisation d'une fonction de deux variables:
test d'extremum local </Font><Font bold="true" family="Times New Roman" italic="false" size="18" style="_cstyle271" underline="false"> </Font></Text-field><Text-field layout="Author" style="ParagraphStyle1"><Font encoding="ISO8859-1" family="Times New Roman" style="_cstyle268"> \251 Pierre Lantagne </Font><Font family="Times New Roman" style="_cstyle272">(juin 2001)</Font></Text-field><Text-field layout="_pstyle258" style="_cstyle266"><Font encoding="ISO8859-1" family="Times New Roman">Coll\350ge de Maisonneuve</Font></Text-field><Text-field layout="_pstyle259" style="_cstyle267"><Font family="Times New Roman">plantag@edu.cmaisonneuve.qc.ca</Font></Text-field><Text-field layout="_pstyle260" style="Hyperlink"><Hyperlink family="Times New Roman" hyperlink="true" linktarget="http://math.cmaisonneuve.qc.ca/plantagne" style="Hyperlink">http://math.cmaisonneuve.qc.ca/plantagne</Hyperlink></Text-field><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Cette feuille a pour objectif de montrer comment utiliser Maple pour trouver les extremums locaux d'une fonction f explicite de deux variables par l'application du test d'extremum local. La fonction doit d'abord satisfaire \340 la condition d'applicabilit\351 du test, soit rechercher avec Maple les points critiques (a,b) d'une fonction f telles que </Font><Equation input-equation="diff(f(x,y),x);" style="2D Comment">NiMtJSVkaWZmRzYkLSUiZkc2JCUieEclInlHRik=</Equation><Font family="Times New Roman" style="_cstyle306">|</Font><Font family="Times New Roman" style="_cstyle308">(a,b)</Font><Font family="Times New Roman"> = 0 et </Font><Equation input-equation="diff(f(x,y),y);" style="2D Comment">NiMtJSVkaWZmRzYkLSUiZkc2JCUieEclInlHRio=</Equation><Font family="Times New Roman" style="_cstyle317">|</Font><Font family="Times New Roman" style="_cstyle319">(a,b)</Font><Font encoding="ISO8859-1" family="Times New Roman"> = 0. Ensuite, pour obtenir la nature de ces points critiques, il faudra tester chacun de ces points afin de d\351terminer laquelle des conditions suffisantes du test est satisfaite. Rappelons que la validit\351 du test repose sur l'\351galit\351 des d\351riv\351es mixtes </Font><Equation input-equation="diff(f(x,y),x,y) = diff(f(x,y),y,x);" style="2D Comment">NiMvLSUlZGlmZkc2JS0lImZHNiQlInhHJSJ5R0YqRistRiU2JUYnRitGKg==</Equation><Font family="Times New Roman">.</Font></Text-field><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">En fait, on transposera en Maple la d\351marche papier-crayon qui a \351t\351 pr\351sent\351e en classe.</Font></Text-field><Text-field layout="Normal" style="Normal"/><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">restart;</Text-field></Input></Group><Section collapsed="true"><Title><Text-field layout="Heading 1" style="Heading 1"><Font encoding="ISO8859-1" family="Times New Roman"> D\351termination des points critiques</Font></Text-field></Title><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">La premi\350re \351tape dans la recherche d'un extremum relatif consiste \340 rechercher ses points critiques, c'est-\340-dire les points o\371 les d\351riv\351es partielles s'annulent ou les points o\371 les d\351riv\351es partielles n'existent pas.</Font></Text-field><Text-field layout="Normal" style="Normal"><Font family="Times New Roman">Soit </Font><Equation input-equation="f(x,y)=x^4 - 3*x^2*y + 3*y - y^3" style="2D Comment">NiMvLSUiZkc2JCUieEclInlHLCoqJEYnIiIlIiIiKigiIiRGLCokRiciIiNGLEYoRiwhIiIqJkYuRixGKEYsRiwqJEYoRi5GMQ==</Equation><Font encoding="ISO8859-1" family="Times New Roman">. Cr\351ez la fonction f.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">f:=(x,y)-&gt;x^4-3*x^2*y+3*y-y^3;</Text-field></Input></Group><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Calculez maintenant les d\351riv\351es partielles </Font><Equation input-equation="diff(f(x,y),x);" style="2D Comment">NiMtJSVkaWZmRzYkLSUiZkc2JCUieEclInlHRik=</Equation><Font family="Times New Roman">  et  </Font><Equation input-equation="diff(f(x,y),y);" style="2D Comment">NiMtJSVkaWZmRzYkLSUiZkc2JCUieEclInlHRio=</Equation><Font encoding="ISO8859-1" family="Times New Roman"> \340 l'aide de l'op\351rateur de d\351rivation </Font><Font style="_cstyle277">D</Font><Font family="Times New Roman">.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">fx:=D[1](f);
fy:=D[2](f);</Text-field></Input></Group><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal"><Font family="Times New Roman" style="_cstyle273">REMARQUE</Font><Font encoding="ISO8859-1" family="Times New Roman">: En utilisant l'op\351rateur de d\351rivation </Font><Font style="_cstyle276">D</Font><Font family="Times New Roman">, </Font><Equation input-equation="f[x]" style="2D Comment">NiMmJSJmRzYjJSJ4Rw==</Equation><Font family="Times New Roman"> et </Font><Equation input-equation="f[y]" style="2D Comment">NiMmJSJmRzYjJSJ5Rw==</Equation><Font family="Times New Roman"> sont des fonctions des variables <Font style="_cstyle274">x</Font> et <Font style="_cstyle275">y</Font>.</Font></Text-field><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Ensuite, il faut r\351soudre, dans le domaine de d\351finition de f, les \351quations </Font><Equation input-equation="diff(f(x,y),x) = 0;" style="2D Comment">NiMvLSUlZGlmZkc2JC0lImZHNiQlInhHJSJ5R0YqIiIh</Equation><Font family="Times New Roman"> et </Font><Equation input-equation="diff(f(x,y),y) = 0;" style="2D Comment">NiMvLSUlZGlmZkc2JC0lImZHNiQlInhHJSJ5R0YrIiIh</Equation><Font encoding="ISO8859-1" family="Times New Roman">. Vous allez r\351soudre ces \351quations de deux mani\350res: symboliquement et num\351riquement (autrement dit: de mani\350re exacte et de mani\350re approximative).</Font></Text-field><Text-field layout="Normal" style="Normal"/><Text-field layout="_pstyle256" style="_pstyle256"><Font encoding="ISO8859-1" family="Times New Roman" size="14" style="_cstyle256">R\351solution symbolique</Font><Font family="Times New Roman" size="14" style="_cstyle297"> (</Font><Font encoding="ISO8859-1" family="Times New Roman" style="_cstyle281">r\351solution exacte</Font><Font family="Times New Roman" size="14" style="_cstyle282">)</Font></Text-field><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">La macro-commande \340 utiliser pour la r\351solution symbolique d'une \351quation (d'in\351quation), d'un ensemble d'\351quations (d'in\351quations) , est la macro-commande </Font><Font style="_cstyle293">solve</Font><Font encoding="ISO8859-1" family="Times New Roman">. De plus, afin de ne retenir que les racines r\351elles, vous utiliserez l'astuce suivante: r\351solvez en m\352me temps l'in\351quation </Font><Equation input-equation="x&lt;infinity" style="2D Comment">NiMyJSJ4RyUpaW5maW5pdHlH</Equation><Font family="Times New Roman">.</Font></Text-field><Text-field layout="Normal" style="Normal"><Font family="Times New Roman"> </Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">Sol_symboliques:=solve({fx(x,y)=0,fy(x,y)=0,x&lt;infinity},{x,y});</Text-field></Input></Group><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal"><Font family="Times New Roman">Lorsqu'on utilise la macro-commande </Font><Font style="_cstyle278">solve</Font><Font encoding="ISO8859-1" family="Times New Roman">, les racines obtenues peuvent ne pas \352tre donn\351es de mani\350re explicite. Afin d'obtenir de fa\347on explicite ces racines formul\351es en termes de </Font><Font style="_cstyle280">RooOf</Font><Font family="Times New Roman">, appliquez la macro-commande </Font><Font style="_cstyle279">allvalues</Font><Font family="Times New Roman"> sur ces racines.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">Sol_symboliques:=map(allvalues,{Sol_symboliques});</Text-field></Input></Group><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">L'usage des accolades a pour but d'\351viter la r\351p\351tition des racines.</Font></Text-field><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Le listage de tous les points critiques est fait automatiquement gr\342ce \340 la proc\351dure maison suivante. On pourrait tout aussi bien \351tablir la liste manuellement.</Font></Text-field><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Initialisez donc cette proc\351dure en ex\351cutant tout le bloc. </Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">Points_Critiques:=proc(Sol_symboliques::set)
global x,y;
local Ensemble,k,ordre;
Ensemble:={};
for k from 1 to nops(Sol_symboliques) do
assign(Sol_symboliques[k]);
Ensemble:=Ensemble union {[x,y]};
x:='x':y:='y':
od;
ordre:=(x,y)-&gt;evalb(evalf(op(1,x)&lt;=op(1,y))):
sort(convert(Ensemble,list),ordre)
end:</Text-field></Input></Group><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Par commodit\351, donnez donc le nom P \340 la liste des points critiques.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">P:=Points_Critiques(Sol_symboliques);
</Text-field></Input></Group><Text-field layout="Normal" style="Normal"><Font family="Times New Roman">Les quatres points critiques de cette fonction sont les points </Font><Equation input-equation="[-1/2*sqrt(3), 1/2], [0, -1], [0, 1], [1/2*sqrt(3), 1/2]" style="2D Comment">NiY3JCwkKigiIiJGJiIiIyEiIi0lJXNxcnRHNiMiIiRGJkYoKiZGJkYmRidGKDckIiIhLCRGJkYoNyRGL0YmNyRGJUYt</Equation><Font family="Times New Roman">.  </Font></Text-field><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman" style="_cstyle257">R\351solution num\351rique</Font><Font family="Times New Roman" style="_cstyle298"> (</Font><Font encoding="ISO8859-1" family="Times New Roman">r\351solution approximative</Font><Font family="Times New Roman" style="_cstyle283">)</Font></Text-field><Text-field layout="Normal" style="Normal"><Font family="Times New Roman">La macro-commande </Font><Font style="_cstyle258">fsolve</Font><Font encoding="ISO8859-1" family="Times New Roman"> est \340 utiliser pour trouver une approximation d\351cimale des racines. Cette m\351thode est, en g\351n\351ral, plus d\351licate d'application. En fait, l'efficacit\351 de cette approche repose beaucoup sur la connaissance de valeurs d'amorce qui sont pas "trop" \351loign\351es des racines qu'on cherche \340 approximer. </Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">Sol_numeriques := fsolve({fx(x,y)=0,fy(x,y)=0},{x,y});</Text-field></Input></Group><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Sachez qu'en donnant un intervalle d'amorce appropri\351, la macro-commande </Font><Font style="_cstyle294">fsolve</Font><Font encoding="ISO8859-1" family="Times New Roman"> s'av\351rera plus efficace. Par exemple,</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">Sol_numeriques := fsolve({fx(x,y)=0,fy(x,y)=0},{x,y},{x=-2..0,y=-1..0});</Text-field></Input></Group><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Les intervalles d'amorce ne s'obtiennent \351videmment pas par hasard. Un graphique de la situation est tr\350s utile.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"/></Input></Group></Section><Section collapsed="true"><Title><Text-field layout="Heading 1" style="_cstyle259"><Font family="Times New Roman" foreground="[128,0,128]"> Application du test d'extremum local</Font></Text-field></Title><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Cr\351ez les fonctions n\351cessaires au calcul du discriminant </Font><Equation input-equation="Delta(x,y);" style="2D Comment">NiMtJSZEZWx0YUc2JCUieEclInlH</Equation><Font encoding="ISO8859-1" family="Times New Roman">, soit les fonctions d\351riv\351es successives d'ordre 2  </Font><Equation input-equation="f[xx]" style="2D Comment">NiMmJSJmRzYjJSN4eEc=</Equation><Font family="Times New Roman"> et  </Font><Equation input-equation="f[yy]" style="2D Comment">NiMmJSJmRzYjJSN5eUc=</Equation><Font encoding="ISO8859-1" family="Times New Roman"> d\351finies respectivement par </Font><Equation input-equation="f[xx](x,y) = diff(f(x,y),`$`(x,2));" style="2D Comment">NiMvLSYlImZHNiMlI3h4RzYkJSJ4RyUieUctJSVkaWZmRzYkLUYmRiktJSIkRzYkRioiIiM=</Equation><Font family="Times New Roman"> et par </Font><Equation input-equation="f[yy](x,y) = diff(f(x,y),`$`(y,2));" style="2D Comment">NiMvLSYlImZHNiMlI3l5RzYkJSJ4RyUieUctJSVkaWZmRzYkLUYmRiktJSIkRzYkRisiIiM=</Equation><Font encoding="ISO8859-1" family="Times New Roman"> ainsi que la fonction d\351riv\351e mixte </Font><Equation input-equation="f[xy]" style="2D Comment">NiMmJSJmRzYjJSN4eUc=</Equation><Font encoding="ISO8859-1" family="Times New Roman"> d\351finie par </Font><Equation input-equation="f[xy](x,y) = diff(f(x,y),x,y);" style="2D Comment">NiMvLSYlImZHNiMlI3h5RzYkJSJ4RyUieUctJSVkaWZmRzYlLUYmRilGKkYr</Equation><Font family="Times New Roman">.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">fxx:=D[1](fx);
fyy:=D[2](fy);
fxy:=D[2](fx);</Text-field></Input></Group><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Cr\351ez finalement la fonction discriminant </Font><Equation input-equation="Delta;" style="2D Comment">NiMlJkRlbHRhRw==</Equation><Font encoding="ISO8859-1" family="Times New Roman"> qui servira \340 calculer sa valeur avec chacun des points critiques:</Font></Text-field><Text-field layout="_pstyle261" style="2D Comment"><Equation input-equation="Delta(x,y) = f[xx](x,y)*f[yy](x,y)-f[xy]^2(x,y);" style="2D Comment">NiMvLSUmRGVsdGFHNiQlInhHJSJ5RywmKiYtJiUiZkc2IyUjeHhHRiYiIiItJkYtNiMlI3l5R0YmRjBGMCkmRi02IyUjeHlHLSIiI0YmISIi</Equation></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">Delta:=(x,y)-&gt;fxx(x,y)*fyy(x,y)-(fxy^2)(x,y);</Text-field></Input></Group><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Dans le but d'\352tre concis, r\351sumez dans un tableau les valeurs de </Font><Equation input-equation="Delta(x,y)" style="2D Comment">NiMtJSZEZWx0YUc2JCUieEclInlH</Equation><Font family="Times New Roman"> et de </Font><Equation input-equation="f[xx](x,y);" style="2D Comment">NiMtJiUiZkc2IyUjeHhHNiQlInhHJSJ5Rw==</Equation><Font family="Times New Roman"> en chacun des points critiques.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">printf(`\n         Points critiques    |   Discriminant  |  Valeur de fxx \n`); 
seq(printf("%25a    | %10a      |%10a \n", P[k],Delta(op(1,op(k,P)),op(2,op(k,P))),fxx(op(1,op(k,P)),op(2,op(k,P)))),k=1..nops(P));</Text-field></Input></Group><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman" style="_cstyle295">Reste donc \340 conclure</Font><Font family="Times New Roman">: le point </Font><Equation input-equation="[0,-1]" style="2D Comment">NiM3JCIiISwkIiIiISIi</Equation><Font family="Times New Roman"> est un minimum local, </Font><Equation input-equation="[0, 1]" style="2D Comment">NiM3JCIiISIiIg==</Equation><Font family="Times New Roman"> est un maximum local , et les deux autres points crtitiques sont des points-selle.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"/></Input></Group></Section><Section collapsed="true"><Title><Text-field layout="Heading 1" style="_cstyle260"><Font family="Times New Roman" foreground="[128,0,128]"> Graphique de la surface et des points critiques</Font></Text-field></Title><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Illustrez maintenant la nature de ces quatre points critiques en superposant d'abord le trac\351 de la surface et celui des points critiques (qui appartiennent, bien s\373r, \340 la surface).</Font></Text-field><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">La difficult\351 \340 surmonter avec une telle repr\351sentation est, \351videmment, de pr\351ciser des intervalles appropri\351s pour les variables </Font><Font family="Times New Roman" style="_cstyle284">x</Font><Font family="Times New Roman"> et <Font style="_cstyle285">y</Font><Font encoding="ISO8859-1"> de sorte qu'on puisse inclure tous les points critiques dans la superposition pour que cela puisse se voir de fa\347on clair. L'exemple qui est ici s'y pr\352te bien sans trop de difficult\351s.</Font></Font></Text-field><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Cr\351ez d'abord la structure graphique de cette surface puis affichez-la.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">with(plots,display);</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">Surface:=plot3d([x,y,f(x,y)],x=-1.5..1.5,y=-1.5..1.5):
display(Surface,axes=framed,orientation=[131,60]);</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"/></Input></Group><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Ensuite, obtenez le trac\351 de tous les points critiques de la surface en cr\351ant d'abord la liste de ces points critiques comme points de l'espace.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">Points_surface:=seq([op(1,P[k]),op(2,P[k]),f(op(1,P[k]),op(2,P[k]))],k=1..nops(P));</Text-field></Input></Group><Text-field layout="Normal" style="Normal"><Font family="Times New Roman">La macro-commande </Font><Font style="_cstyle286">pointplot3d</Font><Font family="Times New Roman"> de l'extension </Font><Font style="_cstyle287">plots</Font><Font encoding="ISO8859-1" family="Times New Roman"> sera ici tr\350s utile.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">with(plots,pointplot3d);</Text-field></Input></Group><Text-field layout="Normal" style="Normal"><Font family="Times New Roman">Donnez l'option </Font><Font style="_cstyle296">patchnogrid</Font><Font family="Times New Roman"> pour mieux voir ces points critiques sur la surface.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">Points:=pointplot3d([Points_surface],symbol=circle,color=black):
display({Surface,Points},axes=framed,style=patchnogrid,orientation=[131,60]);</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"/></Input></Group><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">\300 l'aide de la macro-commande </Font><Font style="_cstyle288">spacecurve</Font><Font family="Times New Roman"> de l'extension </Font><Font style="_cstyle289">plots</Font><Font encoding="ISO8859-1" family="Times New Roman">, tracez des courbes sur cette surface afin de mettre en \351vidence la nature de ces extrema locaux.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">with(plots,spacecurve);</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">Courbe_max:=spacecurve([x,1,f(x,1)],x=-1.5..1.5,color=navy,thickness=3):
Courbe_min:=spacecurve([x,-1,f(x,-1)],x=-1.5..1.5,color=orange,thickness=3):
Courbe:=spacecurve([0,y,f(0,y)],y=-1.5..1.5,color=magenta,thickness=3):</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">display({Surface,Courbe_max,Courbe_min,Courbe,Points},axes=framed, style=patchnogrid,orientation=[131,60]);</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"/></Input></Group><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Pour mieux observer la nature de ces points critiques, cliquez sur le graphique pr\351c\351dent en maintenant le bouton gauche enfonc\351 et modifiez l'orientation du graphique.</Font></Text-field><Text-field layout="Dash Item" style="Dash Item"><Font encoding="ISO8859-1" family="Times New Roman">Au point [0,1,2]: dans la direction de la courbe de couleur bleu, le point critique pr\351sente un maximum local et de m\352me dans la direction de la courbe de couleur magenta.</Font></Text-field><Text-field layout="Dash Item" style="Dash Item"><Font encoding="ISO8859-1" family="Times New Roman">Au point [0,-1,-2]: dans la direction de la courbe de couleur orange, le point critique pr\351sente un minimum local et de m\352me dans la direction de la courbe de couleur magenta.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">display({Courbe_max,Courbe_min,Courbe,Points},axes=framed, style=patchnogrid,orientation=[131,60]);</Text-field></Input></Group><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman"> Tracez maintenant des courbes sur cette surface afin de mettre en \351vidence la nature des points-selle.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">Courbe_A:=spacecurve([-sqrt(3)/2,y,f(-sqrt(3)/2,y)],y=-1.5..1.5,color=navy,thickness=3):
Courbe_B:=spacecurve([sqrt(3)/2,y,f(sqrt(3)/2,y)],y=-1.5..1.5,color=orange,thickness=3):
Courbe:=spacecurve([x,0.5,f(x,0.5)],x=-1.5..1.5,color=magenta,thickness=3):</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">display({Surface,Points,Courbe_A,Courbe_B,Courbe},axes=framed,style=patchnogrid,orientation=[130,60]);</Text-field></Input></Group><Text-field layout="Dash Item" style="Dash Item"><Font family="Times New Roman">Au point </Font><Equation input-equation="[-sqrt(3)/2, 1/2, 13/16];" style="2D Comment">NiM3JSwkKiYtJSVzcXJ0RzYjIiIkIiIiIiIjISIiRiwqJkYqRipGK0YsKiYiIzhGKiIjO0Ys</Equation><Font encoding="ISO8859-1" family="Times New Roman">: dans la direction de la courbe de couleur bleu, le point critique pr\351sente un maximum local et un minimum local dans la direction de la courbe de couleur magenta.</Font></Text-field><Text-field layout="Dash Item" style="Dash Item"><Font family="Times New Roman">Au point </Font><Equation input-equation="[sqrt(3)/2, 1/2, 13/16];" style="2D Comment">NiM3JSomLSUlc3FydEc2IyIiJCIiIiIiIyEiIiomRilGKUYqRisqJiIjOEYpIiM7Ris=</Equation><Font encoding="ISO8859-1" family="Times New Roman">: dans la direction de la courbe de couleur orange, le point critique pr\351sente un maximum local et un minimum local dans la direction de la courbe de couleur magenta.</Font></Text-field><Text-field layout="Normal" style="Normal"><Font family="Times New Roman">Ces deux points sont donc bien des points-selle.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">display({Points,Courbe_A,Courbe_B,Courbe},axes=framed,style=patchnogrid,orientation=[125,80]);</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"/></Input></Group></Section><Section collapsed="true"><Title><Text-field layout="Heading 1" style="_cstyle261"><Font family="Times New Roman" foreground="[128,0,128]"> Impuissance du test d'extremum local</Font></Text-field></Title><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Dans le cas o\371  </Font><Equation input-equation="Delta(x,y) = 0;" style="2D Comment">NiMvLSUmRGVsdGFHNiQlInhHJSJ5RyIiIQ==</Equation><Font family="Times New Roman"> (ou de la non-existence de  </Font><Equation input-equation="diff(f(x,y),x);" style="2D Comment">NiMtJSVkaWZmRzYkLSUiZkc2JCUieEclInlHRik=</Equation><Font family="Times New Roman"> ou de  </Font><Equation input-equation="diff(f(x,y),y);" style="2D Comment">NiMtJSVkaWZmRzYkLSUiZkc2JCUieEclInlHRio=</Equation><Font encoding="ISO8859-1" family="Times New Roman"> ), le test est impuissant: on ne peut rien conclure quant \340 la nature des points critiques. Dans ce cas, l'approche graphique est d'une tr\350s grande utilit\351 pour examiner la fonction au voisinage du ou des points critiques.</Font></Text-field><Section collapsed="true"><Title><Text-field layout="Heading 2" style="_cstyle262"><Font family="Times New Roman" foreground="[128,0,128]"> Exemple 1</Font></Text-field></Title><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Soit la fonction f d\351finie par </Font><Equation input-equation="f(x,y) = x^3 + y^2" style="2D Comment">NiMvLSUiZkc2JCUieEclInlHLCYqJEYnIiIkIiIiKiRGKCIiI0Ys</Equation><Font family="Times New Roman">. </Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">f:=(x,y)-&gt;x^3+y^2;</Text-field></Input></Group><Text-field layout="Normal" style="Normal"><Font family="Times New Roman">Obtenez les points critiques de cette fonction.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">fx:=D[1](f);
fy:=D[2](f);</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">Sol_symboliques:=solve({fx(x,y)=0,fy(x,y)=0,x&lt;infinity},{x,y});</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">Sol_symboliques:=map(allvalues,{Sol_symboliques});</Text-field></Input></Group><Text-field layout="Normal" style="Normal"><Font family="Times New Roman">Nous avons obtenu qu'un seul point critique.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">P:=Points_Critiques(Sol_symboliques);</Text-field></Input></Group><Text-field layout="Normal" style="Normal"><Font family="Times New Roman">Calculez maintenant le discriminant </Font><Equation input-equation="Delta" style="2D Comment">NiMlJkRlbHRhRw==</Equation><Font family="Times New Roman">.</Font></Text-field><Group><Input><Text-field layout="Normal" style="Maple Input">fxx:=D[1](fx);
fxy:=D[2](fx);
fyy:=D[2](fy);
Delta:=(x,y)-&gt;fxx(x,y)*fyy(x,y)-(fxy^2)(x,y);
Delta((0,0));</Text-field></Input></Group><Text-field layout="Normal" style="Normal"><Font family="Times New Roman">Ainsi, puisque </Font><Equation input-equation="Delta=0" style="2D Comment">NiMvJSZEZWx0YUciIiE=</Equation><Font encoding="ISO8859-1" family="Times New Roman">, on ne peut rien conclure quant \340 la nature de ce point critique. Esquissez un graphique de cette situation.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">Surface:=plot3d([x,y,f(x,y)],x=-2..2,y=-2..2,axes=framed):
Points:=pointplot3d([0,0,f(0,0)],symbol=circle,color=black):
display({Surface,Points},axes=framed,style=patchnogrid,orientation=[-150,65]);</Text-field></Input></Group><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Pour mieux observer la nature de ce point critique, cliquez sur le graphique pr\351c\351dent en maintenant le bouton gauche enfonc\351 et modifiez l'orientation du graphique.</Font></Text-field><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal"><Font family="Times New Roman">On observe donc que ce point n'est ni un minimum local ni un maximum local. Ce point n'est pas non plus un point-selle.</Font></Text-field><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Tracez des courbes sur cette surface afin de mettre en \351vidence la nature de ce point critique.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">Courbe_A:=spacecurve([0,y,f(0,y)],y=-2..2,color=navy,thickness=3):
Courbe_B:=spacecurve([x,0,f(x,0)],x=-2..2,color=orange,thickness=3):
display({Surface,Points,Courbe_A,Courbe_B},axes=framed,style=patchnogrid,orientation=[-150,65]);</Text-field></Input></Group><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">On voit maintenant que ce point critique n'est pas un point-selle. En effet, dans la direction de la courbe de couleur bleu, le point critique se pr\351sente comme un minimum local mais dans la direction de la courbe de couleur orange, le point critique se pr\351sente pas comme un maximum local mais plut\364t comme un point \253 plateau \273, c'est-\340-dire comme un point d'inflexion o\371 la tangente est horizontale.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">display({Points,Courbe_A,Courbe_B},axes=framed,style=patchnogrid,orientation=[-115,90]);</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"/></Input></Group></Section><Section collapsed="true"><Title><Text-field layout="Heading 2" style="_cstyle263"><Font family="Times New Roman" foreground="[128,0,128]"> Exemple 2</Font></Text-field></Title><Text-field layout="Normal" style="Normal"><Font family="Times New Roman" style="_cstyle290"> </Font><Font encoding="ISO8859-1" family="Times New Roman" style="_cstyle291">Soit la fonction f d\351finie par </Font><Equation input-equation="f(x,y) = x^2+y^4;" style="_cstyle292">NiMvLSUiZkc2JCUieEclInlHLCYqJEYnIiIjIiIiKiRGKCIiJUYs</Equation></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">f:=(x,y)-&gt;x^2+y^4;</Text-field></Input></Group><Text-field layout="Normal" style="Normal"><Font family="Times New Roman">Obtenez les points critiques de cette fonction.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">fx:=D[1](f);
fy:=D[2](f);</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">Sol_symboliques:=solve({fx(x,y)=0,fy(x,y)=0,x&lt;infinity},{x,y});</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">Sol_symboliques:=map(allvalues,{Sol_symboliques});</Text-field></Input></Group><Text-field layout="Normal" style="Normal"><Font family="Times New Roman">Nous avons obtenu qu'un seul point critique.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">P:=Points_Critiques(Sol_symboliques);</Text-field></Input></Group><Text-field layout="Normal" style="Normal"><Font family="Times New Roman">Calculez maintenant le discriminant </Font><Equation input-equation="Delta" style="2D Comment">NiMlJkRlbHRhRw==</Equation><Font family="Times New Roman">.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">fxx:=D[1](fx);
fxy:=D[2](fx);
fyy:=D[2](fy);
Delta:=(x,y)-&gt;fxx(x,y)*fyy(x,y)-(fxy^2)(x,y);
Delta((0,0));</Text-field></Input></Group><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal"><Font family="Times New Roman">Encore ici, puisque </Font><Equation input-equation="Delta(0,0) = 0;" style="2D Comment">NiMvLSUmRGVsdGFHNiQiIiFGJ0Yn</Equation><Font encoding="ISO8859-1" family="Times New Roman">, on ne peut rien conclure quant \340 la nature de ce point critique. Esquissez un graphique de cette situation.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">Surface:=plot3d([x,y,f(x,y)],x=-2..2,y=-2..2,axes=framed):
Points:=pointplot3d([0,0,f(0,0)],symbol=circle,color=black):
display({Surface,Points},axes=framed,style=patchnogrid,orientation=[-150,45]);</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"/></Input></Group><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Pour mieux observer la nature de ce point critique, cliquez sur le graphique pr\351c\351dent en maintenant le bouton gauche enfonc\351 et modifiez l'orientation du graphique.</Font></Text-field><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal"><Font family="Times New Roman">On observe donc que ce point est effectivement un minimum local.</Font></Text-field><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Tracez des courbes sur cette surface afin de mettre en \351vidence la nature de ce point critique.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">Courbe_A:=spacecurve([0,y,f(0,y)],y=-2..2,color=navy,thickness=3):
Courbe_B:=spacecurve([x,0,f(x,0)],x=-2..2,color=orange,thickness=3):
display({Surface,Points,Courbe_A,Courbe_B},axes=framed,style=patchnogrid,orientation=[-145,120]);</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">display({Points,Courbe_A,Courbe_B},axes=framed,style=patchnogrid,orientation=[-145,120]);</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"/></Input></Group><Text-field layout="Normal" style="Normal"><Font family="Times New Roman">Puisque </Font><Equation input-equation="f(x,y) = x^2+y^4" style="2D Comment">NiMvLSUiZkc2JCUieEclInlHLCYqJEYnIiIjIiIiKiRGKCIiJUYs</Equation><Font encoding="ISO8859-1" family="Times New Roman">, on conclu m\352me que le point [0,0] est un minimum absolu.</Font></Text-field></Section><Section collapsed="true"><Title><Text-field layout="Heading 2" style="_cstyle299"><Font family="Times New Roman" foreground="[128,0,128]"> Exemple 3</Font></Text-field></Title><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman" style="_cstyle300">Soit la fonction f d\351finie par </Font><Equation input-equation="f(x,y)" style="2D Comment">NiMtJSJmRzYkJSJ4RyUieUc=</Equation><Font family="Times New Roman" style="_cstyle301"> = </Font><Equation input-equation="-x^2+y^(2/3);" style="2D Comment">NiMsJiokJSJ4RyIiIyEiIiklInlHKiZGJiIiIiIiJEYnRis=</Equation></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">f:=(x,y)-&gt;-(x^2+y^(2/3));</Text-field></Input></Group><Text-field layout="Normal" style="Normal"><Font family="Times New Roman">Obtenez les points critiques de cette fonction.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">fx:=D[1](f);
fy:=D[2](f);</Text-field></Input></Group><Text-field layout="Normal" style="Normal"><Equation input-equation="diff(f(x,y),y);" style="2D Comment">NiMtJSVkaWZmRzYkLSUiZkc2JCUieEclInlHRio=</Equation><Font family="Times New Roman"> n'existe pas quand </Font><Equation input-equation="y=0" style="2D Comment">NiMvJSJ5RyIiIQ==</Equation><Font family="Times New Roman">. Ce qui rend tout l'axe des <Font style="_cstyle302">x</Font> en points critiques: <Font encoding="ISO8859-1" style="_cstyle305">la fonction f poss\350de donc une infinit\351 de points critiques</Font>.</Font></Text-field><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Puisque la condition n\351cessaire d'applicabilit\351 du test n'est pas satisfaite, le test d'extremum local est impuissant. Tracez donc le graphique en mettant en \351vidence l'axe des </Font><Font family="Times New Roman" style="_cstyle303">x</Font><Font family="Times New Roman">.</Font></Text-field><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Pour obtenir un trac\351 correct de la fonction, il est n\351cessaire de red\351finir la puissance </Font><Equation input-equation="2/3;" style="2D Comment">NiMqJiIiIyIiIiIiJCEiIg==</Equation><Font family="Times New Roman"> avec la macro-commande </Font><Font style="_cstyle304">surd</Font><Font family="Times New Roman"> (pourquoi ?).</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">f:=(x,y)-&gt;-(x^2+surd(y^2,3));
Surface:=plot3d([x,y,f(x,y)],x=-1..1,y=-2..2):
display({Surface},axes=normal,orientation=[50,60]);</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"/></Input></Group><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Superposez \340 la surface tous les points critiques.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">Points:=spacecurve([x,0,f(x,0)],x=-1..1,thickness=3,color=orange):
display({Surface,Points},axes=normal,orientation=[50,60]);</Text-field></Input></Group><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal"><Font family="Times New Roman">Le graphique montre clairement que </Font><Equation input-equation="f(0,0)=0" style="2D Comment">NiMvLSUiZkc2JCIiIUYnRic=</Equation><Font encoding="ISO8859-1" family="Times New Roman"> est \340 la fois un maximum local et le maximum absolu de f sur tout son domaine </Font><Equation input-equation="R ^2" style="_cstyle256">NiMqJCUiUkciIiM=</Equation></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">display({Points},axes=normal,orientation=[50,60]);</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"/></Input></Group></Section></Section><Text-field/></Worksheet>