Comment #10 on issue 1769 by gupta.ha...@gmail.com: cos(oo) should return nan
http://code.google.com/p/sympy/issues/detail?id=1769

As evaluating a function at infinity is synonymous with evaluating it's limit at infinity. I guess we should write a special case to evaluate the limit when substituting something with infinity.

https://github.com/sympy/sympy/pull/2599

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