Comment #8 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
check=True substitutes and checks for equality. But if you substitute x=0 in sin(x)/x-1 you get a discontinuity, so check=True discards this solution. The problem is to find a way to tell solve that such solutions at removable discontinuities are desired as results.
As I said, if the limit() function is good enough we can use it instead of making series expansions. Actually this is the better solution as otherwise we are just reimplementing limit() in solve(). So maybe instead removable_discontinuity=True a better name would be check_limit=True for a potential flag to add to solve().
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