Comment #9 on issue 1769 by [email protected]: cos(oo) should return nan
http://code.google.com/p/sympy/issues/detail?id=1769
This comes up with a bunch of functions, actually. If evaluation at oo is
not specifically defined in eval(), it is left alone. This leads to a lot
of wrong results if people use subs instead of limit
In [76]: factorial(oo)
Out[76]: (∞)!
In [77]: limit(exp(x)/factorial(x),x, oo)
Out[77]: 0
In [78]: (exp(x)/factorial(x)).subs(x, oo)
Out[78]: ∞
Should we special case functions evaluated at oo in Mul and Pow
(Function._eval_power)? How would that affect performance?
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