[docs] Minor error in the trigonometry documentation Section 9.2

[Juan Bocadillo]

Hello there,

This is a very minor issue, however I felt that I should point it out. On
this page <http://docs.python.org/library/math.html#math.sin> the sine,
cosine, tangent are listed as being in radians. This is strictly untrue
since the result of these functions is a pure number ratio between two
sides, not an angle.

Kind Regards,
Juan
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