Alexander Belopolsky <belopol...@users.sourceforge.net> added the comment:

IIRC, trigonometric functions, such as sin or cos, are not considered 
"elementary" in the real domain.

The problem with this proposal is where to stop.  Right now the line is drawn 
somewhere at __abs__ and __pow__.  If you add __sin__ and __cos__, you would 
probably want to include __tan__ and the inverses to all three of sin, cos and 
tan.  What about hyperbolic functions: sinh, cosh, tanh, etc?  These are 
actually "elementary" in the usual sense.

-1 and the proper forum for such suggestions in python-ideas rather then the 
bug tracker.

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nosy: +belopolsky

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