# I have question about one integral

igoriance

## The Attempt at a Solution

∫[1/(1+x^2)^2] dx

## Answers and Replies

Homework Helper
What did you try?

Did you try integration by parts, substitution?

WhiteRae
I managed to get it by using substitution and then parts. Try making u=1/(1+x^2) and then when you get du, use u=1/(1+x^2) to solve for x to replace x with u. After that, use parts. Hope that helps I can give a more detailed answer if you still are having trouble.