I'm stumped on these:
The integral of x^3 (1+x^2)^3/2
The integral of the square root of (x^2 - 1)dx/x^3
The integral of x^3 dx/(4-x^2)^2
Well let me edit that--
Trig subs are NOT required, what I meant to say is that I came to my math teacher with some of the work that Jhevon got me started on (thanks again), and he instructed me to also try to work them out using a trig substitution, so i'm back here. Sorry for the confusion