# Math Help - find the integral

1. ## find the integral

im supposed to integrate this but im not sure how.

∫▒〖sin⁡x/(1+〖cos〗^2 x) dx〗. not sure if it showed up right or not, its supposed to read as the integral of sin x/(1 + cos^2 (x)). i thought about using the double angle identities but i still couldn't get rid of the sin x in the numerator. thx in advance.

2. Originally Posted by slapmaxwell1
im supposed to integrate this but im not sure how.

∫▒〖sin⁡x/(1+〖cos〗^2 x) dx〗. not sure if it showed up right or not, its supposed to read as the integral of sin x/(1 + cos^2 (x)). i thought about using the double angle identities but i still couldn't get rid of the sin x in the numerator. thx in advance.
substitution: $u = \cos x$. the integral becomes $- \int \frac 1{1 + u^2}~du$ (do you see why?)

i suppose you can finish up?

3. right i see it, dangit i didnt think of that i was going at it the wrong way!!!! geez. ok ok i see the sub so i can finish the problem thanks again.