>>> from sympy import *
>>> x = Symbol('x')
>>> p = (x**2 + x) / ((x - 1)*(x + 1))
>>> print(p)
(x**2 + x)/((x - 1)*(x + 1))
>>> p = simplify(p)
>>> print(p)
x/(x - 1)
This simplification is only valid for x != -1, and I haven't specified any
restrictions on the range of x. Was this done on purpose, and if so why?
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