Calcule:
(a) integral x e^x d x
(b) integral x^2 e^x d x
© integral x ln x d x
(d) integral ln x d x
(e) integral e^x cos x d x
(f) integral e^-2 x sen x d x.
(g) integral0^1 ln x dx.
(h) integral1^infty xe^-xdx.
(i) integral0^infty e^-x^2 dx.

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