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Improve Math.CotH.
(Just realized that) the idea behind current strangely-looking tanh implementation is to ensure tanh(1e5) = 1 and tanh(−1e5) = −1 instead of NaNs by avoiding ∞ / ∞, and CotH being equivalent to 1 / tanh should do the same.
Additionally, I did CotH(−0.0) = −∞. This also improves behavior around 0: CotH(±1e-100) = ±1e+100 is better answer than ±Inf... and definitely better than always-positive +Inf you can get for nonzero negative values very close to 0 if you just take tanh implementation with numerators and denominators swapped.
Edited by Rika