Help Evaluating Integrals
posted by Amy .
1.) ∫ (2)/(x4) dx
2.) ∫ sec^2x tanx dx
3.) ∫ 2 csc^2 xdx
4.) ∫ (3) / sqtr(x+3) dx
5.) ∫ (2x1) / (x^2  x)

5.) ç (2x1) dx / (x^2  x)
let x^2 x = u
du = 2x 1
Integral = ç du/u = ln u = ln(x^2u)