Here's the work I've done, hopefully there's not too much bad math in it...
...and I stopped right here, seeing that this wouldn't give me the right answer. I'm not ever certain that I can u-sub in this problem like I did. Can someone point me in the right direction please?
Also, thank you Shyam for making sense of this problem for me. I did just want to point out that I'm pretty sure that
but it doesn't change the answer much and it was still a lot of help.