# Integral of Sec^4x

1. Oct 10, 2013

### ibaforsale

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

The ∫sec4x

2. Relevant equations

3. The attempt at a solution

Im not entirely sure how to do this. At first I was thinking u sub but then theres nothing for u'.

2. Oct 10, 2013

### FeDeX_LaTeX

What trig identities do you know involving se(x)?

3. Oct 10, 2013

### LCKurtz

Try writing it as$$\int \sec^2x(1+\tan^2 x)~dx$$and look for a $u$ substitution.