0
{xe^x dx
integrate by parts let
f(x) = x so f'(x) = 1
and g(x) = e^x so g'(x) = e^x
so..
f(x)*g(x) - {(g(x)*f'(x)) dx
therefore xe^x - {(e^x * 1) dx
so..
xe^x - e^x + C
factorize so...
(x-1)e^x + C
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