# Homework Help: Which trig sub do I use?

1. Mar 1, 2012

### crybllrd

1. The problem statement, all variables and given/known data

$\int\frac{dx}{x(x^{2}-1)^{3/2}}$

2. Relevant equations

3. The attempt at a solution

I know I need to use trig sub, but which form? I can't seem to find any that fit this form.

2. Mar 1, 2012

### LCKurtz

A triangle with x on the hypotenuse and 1 on a leg suggests $x=\sec\theta$.