Comment #7 on issue 2818 by smi...@gmail.com: factor() returns nan
http://code.google.com/p/sympy/issues/detail?id=2818
And here is a version with no denominators:
cancel(n)
-2*x**3*(-x**2 + 1)*(x**2 - 1)*(-x**3*(-x**2 + 1)*(x**2 - 1) - x**3*(x**2 -
1)**
2)*(x**4*(x**2 - 1) - x**2*(x**2 - 1) - x**2) - (-2*x**4*(x**2 - 1)**2 -
x**2*(-
x**2 + 1)*(-x**2*(-x**2 + 1) + x**2*(x**2 - 1)))*(x**4*(x**2 - 1)**4 -
x*(-x**3*
(-x**2 + 1)*(x**2 - 1) - x**3*(x**2 - 1)**2))
cancel(n/y)
0
factor(n)
nan
simplify(n)
0
print filldedent(str(n))
-2*x**3*(-x**2 + 1)*(x**2 - 1)*(-x**3*(-x**2 + 1)*(x**2 - 1) -
x**3*(x**2 - 1)**2)*(x**4*(x**2 - 1) - x**2*(x**2 - 1) - x**2) -
(-2*x**4*(x**2 - 1)**2 - x**2*(-x**2 + 1)*(-x**2*(-x**2 + 1) +
x**2*(x**2 - 1)))*(x**4*(x**2 - 1)**4 - x*(-x**3*(-x**2 + 1)*(x**2 -
1) - x**3*(x**2 - 1)**2))
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