Ok, I'm having a bit of trouble with this one:

I'm guessing that I would want to use this trig identity:

which means...

So, the integral with the identity would now look like this:

Then it would be:

Now, with u sub, I would let so this means

So

Now:

Now I'm kind of stuck here, I know how to take the antiderivative of the first part, but not the part.

Any help?