Add missing trigonometric and hyperbolic functions

[diluculo]

All missing trigonometric and hyperbolic functions are added.

[diluculo]

In the internet, I couldn't find any reference to express sinh(n*x) for positive integer n in terms of sinh(x) and cosh(x). The picture below shows my derived formulas that is used in the Trigonometric.expand. It is very similar to already implemented sin(n*x) in the method.

[cdrnet]

Indeed - Abramowitz/Stegun does list expansions for n up to 4, but no generic expression either.

Thanks!