[issue1640] Enhancements for mathmodule

[Mark Dickinson]

Mark Dickinson added the comment:

Why not implement copysign?  It's a standard, familiar function with well-
documented meaning all over the web, and it can easily be used to create 
whatever sign test is necessary, letting the user decide what results 
(s)he wants for +/-0, +/-nan, etc.

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<http://bugs.python.org/issue1640>
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