# Integral help

1. Sep 11, 2008

### imranq

1. The problem statement, all variables and given/known data
It looks deceptively easy, but I can't seem to get it...
$$\int^{\frac{\pi}{4}}_{0}{\\sec^4{x}\tan^4{x}}\,dx$$

2. Relevant equations

$$\sec^2{x} = \tan^2{x} +1$$

3. The attempt at a solution
I've tried, but they all end up as trigonometric polynomials

Last edited: Sep 11, 2008
2. Sep 11, 2008

### Dick

It IS easy. Substitute u=tan(x).

3. Sep 11, 2008

### imranq

ah shoot! Thanks, now I got it

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