.1. Show that (coshx + sinhx)[to the power of] n = coshnx + sinhnx

This is trivial applying the definition of the hyperbolic functions

2. Determine the integral of tanhxdx

.

Take it from here now (if you know integrals of usual trigonometric functions this one won't surprise you).

3. Determine the integral of 4dx/(e to the x + e to the -x)squared

[colo=blue]Get some ideas from the above

Tonio[/color]

PS How can i use the proper math symbols?!!

Using LaTex

Thanks!