I feel so doing this problem. PLEASE HELP!!!! AND TEACH ME How TO DO IT. My question is this. use the substitution x=2tan(y) (37dx)/(x^2*sqrt(x^2+4)) give the answer in terms of y. I did the substition, but it looked more complicated. It doesn't look like a u*du thing, but it does look like some arcsin thing... i couldn't figure it out. The x^2 is bugging me. PLease help!!!