# Homework Help: I have question about one integral

1. Mar 25, 2010

### igoriance

3. The attempt at a solution

∫[1/(1+x^2)^2] dx

2. Mar 25, 2010

### rock.freak667

What did you try?

Did you try integration by parts, substitution?

3. Mar 25, 2010

### 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.