[issue1640] Enhancements for mathmodule

[Mark Dickinson]

Mark Dickinson added the comment:

Cool! If there's a move to add functions to the math module, there are 
some others that are part of C99 (but not C89), would be good to have, and 
that I'd consider more fundamental than the Bessel, error, gamma 
functions;  for example, the inverse hyperbolic trig functions (acosh, 
asinh, atanh), log1p, expm1, copysign.

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nosy: +marketdickinson

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