sympy__sympy-13480

.subs on coth(log(tan(x))) errors for certain integral values

Verdict: the fix is stated in the issue (Tier A).

There is a typo on [line 590](https://github.com/sympy/sympy/blob/master/sympy/functions/elementary/hyperbolic.py#L590): `cotm` should be `cothm`.

The text states the fix: “There is a typo on [line 590](https://github.com/sympy/sympy/blob/master/sympy/functions/elementary/hyperbolic.py#L590): `cotm` should be `cothm`.”

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