Updates:
Status: Valid
Labels: Series
Comment #1 on issue 3500 by [email protected]: limit of fraction with
oscillating term in the numerator calculated incorrectly
http://code.google.com/p/sympy/issues/detail?id=3500
Current master gives PoleError for the first one. cos(oo) is intensional.
It gives a bit more information than nan would (namely, that the limit
points are between -1 and 1). I agree that it seems a bit nonsensical, but
other CASs use this same notation.
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