# Homework Help: Integral involving trig substitution

1. May 10, 2012

### fran1942

Hello, I am trying to integrate 1/(x^2-1).

Apparently this can be solved by using trig substitution involving tan ?

Thanks kindly for any help.

2. May 10, 2012

### sharks

Let $x= \sec \theta$

3. May 10, 2012

### scurty

Alternatively you can use partial fractions decomposition. You can also user $x = \sin{(\theta)}$ and multiply by (-1)/(-1).