Comment #1 on issue 2745 by [email protected]: should cancel expand exp?
http://code.google.com/p/sympy/issues/detail?id=2745
here is an example involving powers:
>>> eq
(-sqrt(x) + 1)**4*(sqrt(x) + 1)**(3/2)/(-x + 1)**3
>>> cancel(_)
(-x**(5/2)*sqrt(sqrt(x) + 1) - 2*x**(3/2)*sqrt(sqrt(x) + 1) +
3*sqrt(x)*sqrt(sqr
t(x) + 1) + 3*x**2*sqrt(sqrt(x) + 1) - 2*x*sqrt(sqrt(x) + 1) -
sqrt(sqrt(x) + 1)
)/(x**3 - 3*x**2 + 3*x - 1)
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