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I checked in a major rewrite of the math module docs, as 
Doc/lib/libmath.tex revision 1.32.  This stuffed in "radians" as 
appropriate (among other things).

Note that the function docstrings already told the radiaion 
story; e.g.,

>>> print math.cos.__doc__
cos(x)

Return the cosine of x (measured in radians).
>>>

I didn't change the cmath docs, and don't intend to.  Anyone 
using complex "angles" who doesn't already know they're 
working in radians shouldn't be allowed to import cmath <0.6 
wink>.