# Thread: Solving This Indefinite Integral

1. ## Solving This Indefinite Integral

It's the integral of sin(5t)/(1+(cos(5t))^2), it seems like there's no plausible substitutions or anything that can be made here, could someone clue me in as to what to do about this problem?

2. Originally Posted by fattydq
It's the integral of sin(5t)/(1+(cos(5t))^2), it seems like there's no plausible substitutions or anything that can be made here, could someone clue me in as to what to do about this problem?
$u = \cos(5t)$

integral will be a form of arctangent.