Which trig sub is needed for this integral?

[crybllrd]

Homework Statement

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

Homework Equations

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.

 

[LCKurtz]

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