Comment #16 on issue 2085 by nicolas.pourcelot: Limit code severely broken.
http://code.google.com/p/sympy/issues/detail?id=2085
"manually tell limit to return nan instead of sin(oo) and cos(oo)"
Concerning sin(oo), I think Aaron suggested to patch cos() and sin(), not
limit().
What's more, N() returns a 'numeric' nan, which is not the same as the
symbolic one:
from sympy import *
type(N(sin(oo))) == type(nan)
False
Anyway, symbolic limit computation should not rely on N().
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