I'm not totally sure how to do this problem. So far, I've done this:
From here, I don't know how to calculate the integral. Is there a trig identity that simplifies the problem? Do I have to integral by parts or substitution? I plugged it into wolframalpa and got a solution but it didn't give me what I really wanted, the steps on how to solve the integral.
Am I even approaching the problem correctly? Thanks