Hello Sympifiers,

I noticed some incorrect results for the following expressions
(1*sin(oo)).n() # nan, correct
(2*sin(oo)).n() # 0, should be nan
(sin(oo)+cos(oo)).n() # 0.e-162, should be nan

Using Kununtu 12.04, SymPy 0.7.2-git (Python 2.7.3-64-bit) (ground types: 
gmpy)
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