Integrate 1/(1+x²)²

[igoriance]

The Attempt at a Solution

Thanks in advance for your help...


∫[1/(1+x^2)^2] dx

 

[rock.freak667]

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.