Question

integrate e^(x-1/x) / x^2 dx

Answer 1

let x-1/x = u. Solving for du takes care of the denominator.

Answer 2

first, simplify for (x-1)/x = x/x - 1/x = 1 - 1/x = 1 - x^(-1)
u = 1 - x^(-1)
du = x^(-2) dx or
du = dx /x^2

Answer 3

wait, which one ur problem :