> (C49) exponentialize(tanh(x));
> x - x
> %E - %E
> (D49) -----------
> x - x
> %E + %E
> Is there a command for the inverse operation?
Here's a useful trick:
subst(x/%i,x,demoivre(subst(x*%i,x,expr)))
This gives you sinh(x)/cosh(x). I'm not sure if there is any standard
way to get sin(h)/cos(h) to simplify to tan(h).
-s