Help with Indefinite integrals.

1. Sep 10, 2008

master1425

1. The problem statement, all variables and given/known data
$$\int sinx/(1+cos^{2}x)dx$$

Can anyone help me with this problem?

Last edited: Sep 10, 2008
2. Sep 10, 2008

Dick

Did you try substituting u=cos(x) as a first step??

3. Sep 10, 2008

master1425

Ah ok, that was my biggest problem. I tried substituting u=1+cos^2x and u=sinx. But neither yielded the result I wanted.

So I will try using just u=cosx and see how that works for me.

4. Sep 10, 2008

master1425

Ok, I got that one finally.

$$\int x^{2}sinx/1+x^{6} dx$$

I tried u=sinx, but got stuck. Is that what I need to use? Any help would be appreciated.