1. The problem statement, all variables and given/known data Improper Integral of theta/cos^2 theta 2. Relevant equations 3. The attempt at a solution Hi all, this was one of the few questions on my final today that I just didn't know how to do. I know how to do trig sub, know all my trig identities and know improper integration, but was a bit at a loss for this one. I could use a half angle for the denominator --> theta / 1/2 [1 + cos(2 theta)] --> Maybe integrate, and get theta^2 / 1/2 theta + 1/2(sin 2 theta). I'm sure what I tried was very wrong, but I wanted to make some kind of attempt. Edit: nevermind, you can't integrate like that.