# Math Help - Finding Integral

1. ## Finding Integral

How to find : Integral [x*dx/( (1+ x^2 + y^2)^(3/2) )] ?

If we would have Integral [x*dx/( (1+ x^2 + y^2)^(1/2) )] => there is could be replacement.

2. If $y$ is independent of $x,$ then let $u=1+x^{2}+y^{2}.$ Where does that lead?

3. Math program gave this solution:

-1/(Sqrt[1+x^2+y^2])
I have no idea how to get it. Help please.

4. If you've done any integration study at all, you've studied u substitutions. Take another look at my post # 2, and try that. If you don't interact with the help you're given, then I'm afraid the Math Help Forum isn't going to be much use to you.