into maths? you rolled your eyes at me at USYD when you pulled out the uni maths/science books i had and said "i cant beleive your into this crap" :mad:
umm this question reminds me of a Patel one... try this. i'm not too sure if it works..
let x = tan^-1 u
.: dx = du/(x^2 +1)
.: the tans cancell out and you're left with
I = (sqrt u)/(u^2 +1) du