[issue1640] Enhancements for mathmodule

[George Castillo]

George Castillo added the comment:

I misunderstood the rationale for the function returning infinite at
those points - I didn't realize that C99 was the governing force behind
the implementation of these functions, rather than mathematical rigor. 
Thanks for pointing it out.  In that case, I agree with you that, in
order to conform, these functions would need to return the values
required by those documents.

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