### 2.23.1 Rewrite hyperbolic functions as exponentials : `hyp2exp`

`hyp2exp` takes as argument an hyperbolic expression.

`hyp2exp` rewrites each hyperbolic functions with exponentials
(as a rational fraction of one exponential,
i.e. without linearization).

Input :

`hyp2exp(sinh(x))`

Output :

`(exp(x)-1/(exp(x)))/2`