Error, (in ...) cannot determine if this expression is true or false: ...
Maple cannot determine whether something is true or false in an if statement or while clause.
A typical occurrence happens when a procedure that requires numeric arguments is called with symbolic arguments:
f:=procxifx<0thenx^3elsex^2end ifend proc
Error, (in f) cannot determine if this expression is true or false: x < 0
Maple evaluates the inputs to a procedure such as plot before it calls the procedure, resulting in f being called with the symbolic argument x. Since x has not yet been assigned a value, Maple cannot determine if x is less than 0. You can either delay the evaluation of the input using unevaluation quotes, or you can supply the arguments with operator form. For details, see uneval.
fsolve, Numerical integration,
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