Question

How do I integrate `f(x)=(x^3e^(2x))/(x^2 +1)^2` by parts?

Answer 1

Wolfram Alpha gives an answer of
`1/2[(1+i)e^(2i)Ei(2x-2i)+(1-i)e^(-2i)Ei(2x+2i)+(e^2x)/(x^2+1)]+C`

Good luck.