1. ## hyperbolic function

This one is causing me quite the trouble.

$\int_\frac{-\pi}{4}^\frac{\pi}{4} cosh(tan\theta)sec^2 d\theta$

im thinking
$\frac{e^x+e^-x}{2}$ but im cant seem to make it work, any help would be appreciated.

Thanks

2. Originally Posted by Itsygo
This one is causing me quite the trouble.

$\int_\frac{-\pi}{4}^\frac{\pi}{4} cosh(tan\theta)sec^2 d\theta$

im thinking
$\frac{e^x+e^-x}{2}$ but im cant seem to make it work, any help would be appreciated.

Thanks
Hint

$(\tan\theta)'=\sec^2 \theta$