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<Text-field style="_pstyle1" layout="_pstyle1"><Font encoding="UTF-8" style="_cstyle1">S\303\251ries de puissances et s\303\251ries de Fourier</Font><Font style="_cstyle2">
</Font></Text-field>
<Text-field style="_pstyle2" layout="_pstyle2"><Font encoding="UTF-8">\302\251 </Font><Hyperlink linktarget="mailto:aleves@vif.com" hyperlink="true"><Font encoding="UTF-8" style="Hyperlink">Andr\303\251 L\303\251vesque</Font></Hyperlink> 

<Font encoding="UTF-8">Cette application maplets permet d'obtenir le d\303\251veloppement en s\303\251rie de Taylor ou de Maclaurin d'une fonction ind\303\251finiment d\303\251rivable au voisinage d'un point ainsi que le d\303\251veloppement en s\303\251rie de Fourier d'une fonction p\303\251riodique continue avec peut-\303\252tre un nombre fini de points de discontinuit\303\251 de premi\303\250re esp\303\250ce. Pour en savoir un peu plus sur les s\303\251ries de Taylor et de Maclaurin, consultez le document pdf  </Font><Hyperlink linktarget="http://www.vif.com/users/aleves/doc/serie.pdf" hyperlink="true"><Font style="Hyperlink">notes de cours</Font></Hyperlink><Font encoding="UTF-8"> sur les suites et s\303\251ries. Pour lancer l'application, cliquez sur !!! ou choississez  Edit -&gt; Execute -&gt; Worksheet. ou placez votre curseur sur une ligne rouge du programme puis cliquez sur la touche retour.</Font></Text-field>
<Text-field style="_pstyle1" layout="_pstyle1"></Text-field>
<Text-field style="_pstyle3" layout="_pstyle3">**************************************</Text-field>
<Group labelreference="L3" drawlabel="true">
<Input>
<Text-field prompt="&gt; " style="_pstyle8" layout="_pstyle8">restart:
  s1:=&quot;sin(x)&quot;: s2:=&quot;cos(x)&quot;: s3:=&quot;exp(x)&quot;: s4:=&quot;1/(1-x)&quot;: s5:=&quot;ln(1+x)&quot;: s6:=&quot;arctan(x)&quot;:

developpement:= proc()
local a, b, f, p, s, sl1, slx, sly:
global e, L, F, tc, tp, fct, rb1, tf1:
use Maplets[Tools] in
  sl1:=Get('SL1'):
  slx:=Get('SLX'):
  sly:=Get('SLY'):
  rb1:=Get('RB1'):
  if Get('TF1')=&quot;&quot; then
<Font encoding="UTF-8">    Maplets[Examples][Message]( &quot;La fonction n'a pas \303\251t\303\251 d\303\251finie.&quot;):
</Font>    return
  else
    if whattype(traperror(Get('TF1'::algebraic)))=string then
      Maplets[Examples][Message](cat(&quot;Erreur: f(x) = &quot;,Get('TF1'))):
      return
    else
      tf1:=Get('TF1'::algebraic)
    fi:
    if (not(is(subs(x=1e-8,tf1),complexcons)) or is(subs(x=1e-8,tf1),complexcons)=FAIL or whattype(traperror(discont(tf1,x)))=string) then
      Maplets[Examples][Message](cat(&quot;Erreur: f(x) = &quot;,convert(tf1,string))):
      return
    fi:
  fi:
  e:=0:  
  f:= x-&gt;convert(tf1,surd):
    if rb1=true then
      if Get('TC')&lt;&gt;&quot;&quot; then
        tc:=Get('TC'::constant):
      else
<Font encoding="UTF-8">        Maplets[Examples][Message](&quot;La valeur de \302\253 C \302\273 n'a pas \303\251t\303\251 d\303\251finie.&quot;):
</Font>        return
      fi:
      if whattype(traperror(taylor(apply(f,x) ,x=tc, sl1)))=string then
        Set('PL1'= plot(0,x=1..2,1..2, axes=NONE)):
<Font encoding="UTF-8">        Maplets[Examples][Message](&quot;La fonction ne poss\303\250de pas de d\303\251veloppement en s\303\251rie\134nde puissances autour des valeurs choisies de C et n.&quot;):
</Font>        return
      fi:
      if whattype(traperror(timelimit(1,convert(apply(f,x), FormalPowerSeries, x=tc, n))))&lt;&gt;string and whattype(traperror(timelimit(1,convert(apply(f,x), FormalPowerSeries, x=tc, n))))&lt;&gt;exprseq then
        s:=subs(infinity=sl1,convert(apply(f,x), FormalPowerSeries, x=tc, n)):
        if s&lt;&gt;f(x) and whattype(traperror(convert(s,sum)))&lt;&gt;string then
          F:=s=convert(s,sum):
        else
          F:=sort(convert(taylor(apply(f,x) ,x=tc, sl1), polynom),[x], ascending):
        fi:
      else
        F:=sort(convert(taylor(apply(f,x) ,x=tc, sl1), polynom),[x], ascending):
      fi:
      if sl1&gt;20 and type(F,equation) then
        Set('TW1'=lhs(F)):Set('TW2'=lhs(F)):
      elif sl1&lt;=20 and type(F,equation) then
        if type(lhs(F),function) then
          p:=op([lhs(F)=add(subs(n=i,op(1,lhs(F))),i=0..sl1)]):
        else
          p:=F
        fi:
        Set('TW1'=p):Set('TW2'=p)
      elif length(convert(F,string))&gt;3000 then
        Set('TW1'=<Font encoding="UTF-8">`Expression\302\240trop\302\240complexe`</Font>): Set('TW2'=NULL):
      else
        Set('TW1'=F):Set('TW2'=F):
      fi:
      courbe():
      Set('PL1'=G):
      fct:=f(x):      
    else
      if Get('TP')&lt;&gt;&quot;&quot; then
        tp:=Get('TP'::constant):
          if evalf(tp)&lt;=0 then
<Font encoding="UTF-8">            Maplets[Examples][Message]( &quot;La valeur de \302\253 P \302\273 doit \303\252tre positive.&quot;):
</Font>            return
          fi            
      else
<Font encoding="UTF-8">        Maplets[Examples][Message]( &quot;La valeur de \302\253 P \302\273 n'a pas \303\251t\303\251 d\303\251finie.&quot;):
</Font>        return
      fi:
      p:=cat(&quot; sur [ &quot;, convert(-tp/2,string),&quot;, &quot;, convert(tp/2,string),&quot; ]&quot;):
      if length(p)&gt;24 then
        p:=&quot; sur [-p/2, p/2]&quot;
      fi:
      Set('LP'(caption)=p): 
      assume(k::integer):
      L:= tp/2:
      subs(x=L/Pi*x, f):
      a[0]:= 1/L*int(f(x), x=-L..L):
      a[k]:= 1/L*int(f(x)*cos(k*Pi/L*x), x=-L..L):
      b[k]:= 1/L*int(f(x)*sin(k*Pi/L*x), x=-L..L):
      F:= sort(a[0]/2+sum(a[k]*cos(k*Pi/L*x)+b[k]*sin(k*Pi/L*x), k=1..sl1),ascending):
      if is(subs(x=0, F), real)=false then 
        Set('PL1'= plot(0,x=1..2,1..2, axes=NONE)):
<Font encoding="UTF-8">        Maplets[Examples][Message](cat(&quot;ERREUR - La fonction f doit \303\252tre continue sur la p\303\251riode P choisie sauf peut \303\252tre en un nombre&quot;, `\134n`, &quot;fini de points de discontinuit\303\251 de premi\303\250re esp\303\250ce (les limites \303\240 gauche et \303\240 droite&quot;, `\134n`, &quot;existent et sont diff\303\251rentes aux points de discontinuit\303\251 de premi\303\250re esp\303\250ce).&quot;)):
</Font>        e:=1:
        return:
      elif length(convert(F,string))&gt;3000 then
        <Font encoding="UTF-8">Set('TW1'=`Expression\302\240trop\302\240complexe`)</Font>: Set('TW2'=<Font encoding="UTF-8">`Expression\302\240trop\302\240complexe`</Font>):
        F:=&quot;Expression trop complexe&quot;:
      else 
        Set('TW1'=F):Set('TW2'=F): 
      fi:
    courbe():
    Set('PL1'=G):
    fct:=f(x):      
    fi:
  end use:
end:

courbe:= proc()
local g1, g2, g3, g4, x1, x2, y1, y2, sl1, slx, sly, rb1:
global e, F, G:
use Maplets[Tools] in
  sl1:=Get('SL1'):
  slx:=Get('SLX'):
  sly:=Get('SLY'):
  rb1:=Get('RB1'):
  F:=parse(Get('TW2')):
  if e=1 then return fi:
  if rb1=true and whattype(F)=`=` then
    F:=rhs(F)
  fi:
  if rb1=true then
    x1:= tc-10*1.02^slx:
    x2:= tc+10*1.02^slx:
    y1:=-5*1.03^sly:
    y2:= 5*1.03^sly:
    g1:= plot(convert(tf1,surd), x=x1..x2, y1..y2, color=red, discont=true, thickness=1, numpoints=200):
    g2:= plot(F, x=x1..x2, y1..y2, color=black, discont=true, thickness=3, numpoints=200):
    g3:= plots[implicitplot](x=tc, x=x1..x2, y=y1..y2, linestyle=3, color=black):
    g4:=plots[textplot]([tc, y2,  typeset(&quot;C = &quot;,tc)], align={RIGHT}, color=black):
    G:=plots[display]([g2, g1, g3, g4], labels=[&quot;&quot;, &quot;&quot;], font=[HELVETICA,9]):
  else
    x1:=-2.5*tp/2*1.02^slx:
    x2:= 2.5*tp/2*1.02^slx:
    y1:=-5*1.03^sly:
    y2:= 5*1.03^sly:
    g1:= plot(convert(tf1,surd), x=max(-tp/2,x1)..min(tp/2,x2), y1..y2, color=red, discont=true, thickness=4, numpoints=200):
    g2:= plot(F, x=x1..x2,y1..y2, color=black, discont=true, thickness=2, numpoints=200):
    G:=plots[display]([g1, g2], labels=[&quot;&quot;, &quot;&quot;], font=[HELVETICA,9]):
  fi
end use
end:

fonction:=proc()
local s1,s2,s3,s4,s5,s6:
use Maplets[Tools] in
if Get('RB1')=true then
  s1:=&quot;sin(x)&quot;: s2:=&quot;cos(x)&quot;: s3:=&quot;exp(x)&quot;: s4:=&quot;1/(1-x)&quot;: s5:=&quot;ln(1+x)&quot;: s6:=&quot;arctan(x)&quot;
else
  s1:=&quot;x&quot;: s2:=&quot;abs(x)&quot;: s3:=&quot;abs(x)/x&quot;: s4:=&quot;(x+abs(x))/2&quot;: s5:=&quot;x^2/2&quot;: s6:=&quot;piecewise(x&gt;=0,(Pi-x)/2,-(Pi+x)/2)&quot;
fi:
Set('MI1'(caption)=s1):
Set('MI2'(caption)=s2):
Set('MI3'(caption)=s3):
Set('MI4'(caption)=s4):
Set('MI5'(caption)=s5):
Set('MI6'(caption)=s6):
end use
end:

conserver:=proc()
use Maplets[Tools] in:
if Get('TW1')=NULL then return fi:
print():print():
print('f(x)'=fct):
 if Get('RB1')=true then
   print():
   print('C' = Get('TC'::constant)):
   print()
 else
   print():
   print(intervalle = [ (-1)*Get('TP'::constant)/2 , Get('TP'::constant)/2 ]):
   print()
 fi:
print(parse(Get('TW2'))):
print():print():
print(G):
print(________________________________________________):
end use
end:

choix:=proc(c)
use Maplets[Tools] in:
 Set('TF1'=Get(MI||c(caption)))
end use
end:

with(Maplets[Elements]):
  ini:= ()-&gt;Action(SetOption('SLX'=0), SetOption('SLY'=0), SetOption('SL1'=3)):

serie:=Maplet('onstartup'=RunWindow('A1'),
Window['A0'](title=&quot;Aide&quot;, height=400, width=520, 'layout' = 'BA0', resizable = false),
BoxLayout['BA0'](
BoxColumn(
TextBox(height=16, editable=false,
&quot;
<Font encoding="UTF-8"> S\303\211RIES DE PUISSANCES
</Font>
<Font encoding="UTF-8">   a) Trouver les d\303\251veloppements en s\303\251ries de Maclaurin
</Font>      des fonctions suivantes.

      f(x) = sin(x)
      f(x) = cos(x)
      f(x) = e^x         (tapez exp(x))
      f(x) = 1/(1-x)
      f(x) = ln(1+x)
      f(x) = arctan(x)

<Font encoding="UTF-8">      En examinant le graphique des d\303\251veloppements en
      s\303\251ries des trois derni\303\250res fonctions, estimer
      l'intervalle ouvert de convergence de ces s\303\251ries.
</Font>
<Font encoding="UTF-8">   b) Trouver les d\303\251veloppements en s\303\251ries de Taylor
</Font>      des fonctions suivantes

      f(x) = ln(x)      autour de c=1, c=2, c=3, c=4
      f(x) = 1/(x^2-4)  autour de c=3, c=4, c=5, c=6

<Font encoding="UTF-8">      En examinant le graphique de ces d\303\251veloppements,
</Font>      estimer l'intervalle ouvert de convergence des
<Font encoding="UTF-8">      s\303\251ries autour de c=k&gt;0 dans le premier cas et
</Font>      autour de c=k&gt;2 dans le second cas.

<Font encoding="UTF-8"> S\303\211RIES DE FOURIER
</Font>
<Font encoding="UTF-8">   Trouver les d\303\251veloppements en s\303\251ries de Fourier
   des fonctions suivantes de p\303\251riode 2*Pi.
</Font>
   f(x) = x              sur [-Pi, Pi]
   f(x) = abs(x)         sur [-Pi, Pi]
   f(x) = abs(x)/x       sur [-Pi, Pi]
   f(x) = x^2/2          sur [-Pi, Pi]
   f(x) = (x+abs(x))/2   sur [-Pi, Pi]

************************

Pour entrer rapidement les fonctions du haut utilisez
le bouton droit de la souris lorsque celle-ci pointe
<Font encoding="UTF-8">sur la case contenant l'\303\251quation de f(x).</Font>

&quot;
),
Button(&quot;FERMER&quot;,CloseWindow('A0'))
)
),

<Font encoding="UTF-8">Window['A1']('title'=&quot;D\303\251veloppement de fonctions en s\303\251ries&quot;, 'menubar'='MB1', height=540, width=800, resizable = false, 'layout' = 'BL1'),
</Font>BoxLayout['BL1'](
  TextField['TW2'](&quot;&quot;, visible=false),  
  BoxRow('inset'=0, 'spacing'=0, 'border'='true',
    BoxColumn('inset'=0, 'spacing'=0, 'halign'=left,
      Label(&quot; &quot;, font=Font('HELVETICA',6)),
<Font encoding="UTF-8">      Label(&quot;S\303\211RIE DE PUISSANCES - S\303\211RIE DE FOURIER&quot;, font=Font('HELVETICA',11)),
</Font>      Label(&quot; &quot;, font=Font('HELVETICA',12)),
      BoxRow('inset'=0, 'spacing'=0,
        CheckBox['RB1'](&quot;&quot;, 'value'=true,  onchange=Action(SetOption('TF1'=&quot;&quot;), Evaluate('PL1'= plot(0,x=1..2,1..2, axes=NONE)), Evaluate('TP'= 2*Pi), SetOption('LP'(caption)=cat(&quot; sur [ &quot;, convert(-Pi,string),&quot;, &quot;, convert(Pi,string),&quot; ]&quot;)), SetOption('TC'(enabled)=true), SetOption('TP'(enabled)=false), SetOption('RB1'(value)=true), SetOption('RB2'(value)=false), SetOption('RB2'(foreground)=&quot;#000000&quot;), Evaluate('TW1'= &quot;&quot;), ini(), SetOption('MI1'(caption)= &quot;sin(x)&quot;), SetOption('MI2'(caption)= &quot;cos(x)&quot;), SetOption('MI3'(caption)= &quot;exp(x)&quot;), SetOption('MI4'(caption)= &quot;ln(1-x)&quot;), SetOption('MI5'(caption)= &quot;ln(1+x)&quot;), SetOption('MI6'(caption)= &quot;arctan(x)&quot;))),
<Font encoding="UTF-8">        Label(&quot; S\303\251rie de puissances en (x-c) de f(x) avec C =&quot;, font=Font('HELVETICA',11)),
</Font>        TextField['TC']('value' = 0, width = 7, 'halign'=center),
        Label(&quot;         &quot;)
      ),
      Label(&quot;  &quot;, font=Font('HELVETICA',4)),
      BoxRow('inset'=0, 'spacing'=0,
        CheckBox['RB2'](&quot;&quot;, 'value'=false, onchange=Action(SetOption('TF1'=&quot;&quot;), Evaluate('PL1'= plot(0,x=1..2,1..2, axes=NONE)), SetOption('TC'(enabled)=false), Evaluate('TC'= 0), SetOption('TP'(enabled)=true), SetOption('RB1'(value)=false), SetOption('RB2'(value)=true), SetOption('RB1'(foreground)=&quot;#000000&quot;), Evaluate('TW1'= &quot;&quot;), ini(), SetOption('MI1'(caption)= &quot;x&quot;), SetOption('MI2'(caption)= &quot;abs(x)&quot;), SetOption('MI3'(caption)= &quot;abs(x)/x&quot;), SetOption('MI4'(caption)= &quot;(x+abs(x))/2&quot;), SetOption('MI5'(caption)= &quot;x^2/2&quot;), SetOption('MI6'(caption)= &quot;piecewise(x&gt;=0,(Pi-x)/2,-(Pi+x)/2)&quot;))),
<Font encoding="UTF-8">        Label(&quot; S\303\251rie de Fourier de f(x) de p\303\251riode p=&quot;, font=Font('HELVETICA',11)),        
</Font>        TextField['TP']('value' = &quot;2*Pi&quot; , width = 7, halign=center, enabled=false),
        Label['LP'](cat(&quot; sur [ &quot;, convert(-Pi,string),&quot;, &quot;, convert(Pi,string),&quot; ]&quot;), font=Font('HELVETICA',11))
      ),
      Label(&quot;  &quot;, font=Font('HELVETICA',12)),
      BoxRow('inset'=0, 'spacing'=0, 
        Label(&quot;  f(x) = &quot;, font=Font('HELVETICA',11)),
        TextField['TF1'](&quot;&quot;, width=35, foreground=red, 'popupmenu'='PM1', onchange = Action(Evaluate('SLX'=0), Evaluate('SLY'=0), Evaluate('SL1'=3))),
      Button['BT1'](&quot;OK&quot;, 'onclick' = Evaluate('function'= 'developpement()'))
      ),
      Label(&quot;  &quot;, font=Font('HELVETICA',6)),
        BoxRow(
<Font encoding="UTF-8">          Label(&quot;  Nombre de termes de la s\303\251rie : &quot;, font=Font('HELVETICA',11)),
</Font>          Slider['SL1'](1..50, 3, 'minorticks'=1, filled=true, 'horizontal', onchange = Action(Evaluate('TW1'=&quot;&quot;), Evaluate('function'= 'developpement()')))
        ),
        MathMLViewer['TW1'](width=370, height=280, fontsize=12)
      )
    ),
    BoxColumn('inset'=0, 'spacing'=0, 'border'='true',
      Plotter['PL1']('value' = plots[textplot]([0, 0, &quot;
Quelques fonctions sont accessibles en utilisant
le bouton droit de la souris lorsque le curseur
pointe sur la zone rectangulaire de saisie de
texte <Font encoding="UTF-8">\303\240 droite de f(x) = .
</Font>&quot;, font=[COURIER,ITALIC,12]], axes=NONE), width=370, height=360),
      BoxRow('inset'=0, 'spacing'=0, 'border'='true',
        &quot;x : &quot;,
        Slider['SLX'](-100..100, 0, 'minorticks'=5, filled=true, 'horizontal', Evaluate('function'= 'developpement()')),
        Slider['SLY'](-100..100, 0, 'minorticks'=5, filled=true, 'horizontal', Evaluate('function'= 'developpement()')),
        &quot; : y&quot;
      ),
        Label(&quot;  &quot;, font=Font('HELVETICA',2)),
      BoxRow('inset'=0, 'spacing'=0,
        Label(&quot;  &quot;, font=Font('HELVETICA',6)),
        Button['BT2'](&quot;Conserver&quot;, onclick=Evaluate(function='conserver()')),
        Label(&quot;                        &quot;, font=Font('HELVETICA',6)),
<Font encoding="UTF-8">        Label(&quot;\302\251 Andr\303\251 L\303\251vesque&quot;, font=Font('HELVETICA',10))
</Font>      )
    )
  ),
  MenuBar['MB1'](
    Menu(&quot;Fichier&quot;,
        MenuItem(&quot;Fermer&quot;, Shutdown())
    ),
    Menu(&quot;?&quot;,
        MenuItem(&quot;Aide&quot;, RunWindow('A0'))
    )
  ),

  ButtonGroup['BG1'](),
  PopupMenu['PM1'](
    MenuItem[MI1](s1, onclick = Action(Evaluate('function'='choix(1)'), Evaluate('function'= 'developpement()'))),
    MenuItem[MI2](s2, onclick = Action(Evaluate('function'='choix(2)'), Evaluate('function'= 'developpement()'))),
    MenuItem[MI3](s3, onclick = Action(Evaluate('function'='choix(3)'), Evaluate('function'= 'developpement()'))),
    MenuItem[MI4](s4, onclick = Action(Evaluate('function'='choix(4)'), Evaluate('function'= 'developpement()'))),
    MenuItem[MI5](s5, onclick = Action(Evaluate('function'='choix(5)'), Evaluate('function'= 'developpement()'))),
    MenuItem[MI6](s6, onclick = Action(Evaluate('function'='choix(6)'), Evaluate('function'= 'developpement()')))
  )
):
Maplets[Display](serie):</Text-field>
</Input>
</Group>
</Worksheet>