Comment #5 on issue 2245 by [email protected]: assumption while canceling the
polynomials
http://code.google.com/p/sympy/issues/detail?id=2245
The example of the last, when the limit of series's terms is analyzing.
e.g. the n-th derivatives of `acos(1-x*x)` at point `x==1` yield ratios of
polynomials, which can't be applied by `simplify` method at point `x==1`:
incorrect result will be (zero instead nan). It makes difficulties for
series (limit) calculation.
For this case the speed slow down about 150 times.
In other words, I should like to have more accurate simplification function
`simplify`, which is not canceling some monomials,
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