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(1/(x**-2 + x**-3)).series(x, 0) returns x**3 - x**4 + O(x**6) which is incorrect. Wolfram Alpha gives x**3 - x**4 + x**5 - x**6 + x**7 + O(x**8).
(1/(x**-2 + x**-3)).series(x, 0)
x**3 - x**4 + O(x**6)
x**3 - x**4 + x**5 - x**6 + x**7 + O(x**8)
This is probably related to #10503.
@jksuom I found wrong behavior in method _eval_nseries in Pow class while debugging this issue #9549
Add test for sympy/sympy#10761
Fixed in f572eea.
More regression tests for sympy/sympy#10761
Taken from sympy/sympy#10762