# Integral of Sec^4x

ibaforsale

The ∫sec4x

## 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'.

## Answers and Replies

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

Homework Helper
Gold Member

The ∫sec4x

## 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'.

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