Hi guys. I have two problems that revolve around trig sub and just want to make sure that I got these right.

1) integral of cos (sqrt(x))^2 / (sqrt(x))

I got (sqrt) x + (1/2)sin(2(sqrt(x)) + C.

2) integral of (x^3) / sqrt (x^2 + 4), with limits from 0 to 2.

For this one, I'm a little confused on how to set this one up. Which trig identity do I use that will successfully satisfy this beginning?