Ok, I've used the trig identities to change the integral to this:
I think what is throwing me off is the fact that this function is under the radial. At this point, would substitution work if I use ? Is this the correct integration method to use?
I think I might have found the solution. The problem is actually a definite integral problem with the lower limit of integration as 0 and the upper limit of integration as pi/2.
I've worked the problem out and came to a solution of -2. Is this correct?