Functions hyperbolic

[Arnaud Usciati]

Hello,

I propose to add the following hyperbolic functions in order to complete sympy. If f is a function :

sech(f) = 1/cosh(f)

csch(f) = 1/sinh(f)

asech(f) = acosh(1/f)

acsch(f) = asinh(1/f)

[Aaron Meurer]

It looks like sech and csch are already there. We definitely should
have all the combinations of trig, arctrig, hyperbolic, and
archyperbolic functions.

Aaron Meurer

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