1. ## integral

Integral of $
(e^x-e^-x)/(e^x+e^-x)
$

I have tried adding the conjugate to the top and bottom but don't know where to go from there. Should I continue that or try a different technique?

2. Hello, stevo970!

If you look at it the right way, it's easy . . .

$\int\frac{e^x-e^{-x}}{e^x+e^{-x}}\,dx$

Let $u$ = the denominator.

We have: . $\begin{array}{ccc}u &=& e^x + e^{-x} \\ du &=& (e^x - e^{-x})\,dx \end{array}$

Hence, we have: . $\int\frac{du}{u}$

Got it?

3. wow ok thank you

4. also noting that this is (sinh(x))/(cosh(x)) may make this become clearer