Comment #5 on issue 2247 by [email protected]: Problem with coth
http://code.google.com/p/sympy/issues/detail?id=2247

But does this: tanh(acoth(x)) ?

(acoth has branches, and at the same time tanh is odd function therefore transpose this branch through itself)

Nevertheless, I remarked another problem that the singular point (x==0) is omited with this simplification. (e.g. issue 2242 )

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