Comment #8 on issue 1769 by asmeu...@gmail.com: cos(oo) should return nan
http://code.google.com/p/sympy/issues/detail?id=1769
One issue with sin(oo) is that it is not treated like nan in the core:
In [74]: sin(oo)/oo
Out[74]: 0
(note that limit(sin(x)/x, x, oo) is 1).
This is because sin(oo)*0 gives 0. I think if we keep sin(oo), it should
be a special object that subclasses from NaN.
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