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restart;
with(student);
I1 := Int(sin(x^2), x = 0 .. 2);
changevar(u = x^2, I1, u);
int(sin(x^2), x = 0 .. 2);
help("erf");
help("FresnelS");
int(1/(9+x^2), x = 0 .. 3);

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