Comment #2 on issue 2743 by [email protected]: expand_trig should work for
hyperbolic trig functions
http://code.google.com/p/sympy/issues/detail?id=2743
the hyper_as_trig function in fu.py (part of PR 1737) allows rewriting of
hyperbolics to trigonometric functions so rather than duplicating code, a
routine can do the transform, expand, transform back:
t, f = hyper_as_trig(cosh(x + y))
f(t.expand(trig=True))
sinh(x)*sinh(y) + cosh(x)*cosh(y)
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