Comment #6 on issue 2992 by [email protected]: add removable_discontinuity flag to 'solve' because check=False produces wrong answers
http://code.google.com/p/sympy/issues/detail?id=2992
I was thinking about as_numer_denom then getting series expansions on those and checking if it is O(x**p)/O(x**q) with p>=q or p<q. Just checking the denom==0 is not enough (sin(x)/x for example).
If there are no series expansions of the numerator and the denominator we try to expand 1/numerator and 1/denominator (for limits of the type oo/oo)
But if all this is already implemented in the limit taking procedures, we can just use the limit function, as all that I have described is just a fancy version of l'Hopital's rule.
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