[issue3366] Add gamma function, error functions and other C99 math.h functions to math module

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

> expm1(x) = sinh(x/2)*exp(x/2)

Should be 2*sinh(x/2)*exp(x/2).

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue3366>
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