This is the exact same kind of expression as at
https://groups.google.com/forum/#!topic/sympy/ibBh-i6DevE.

Aaron Meurer

On Mon, Sep 16, 2013 at 6:25 AM, Boris Kheyfets <[email protected]> wrote:
> Hello SymPy users,
>
> Is there a way to make SymPy cancel common expression? For example:
>
> from sympy import *
> var("a b")
> b = 1/(sqrt(a) - 1)**(S(8)/3)
> b.diff(a) / (2 * sqrt(2) * b**(S(3)/4)) # gives:
> -sqrt(2)/(3*sqrt(a)*(sqrt(a) - 1)**(11/3)*((sqrt(a) - 1)**(-8/3))**(3/4))
>
> I want SymPy to cancel sqrt(a) - 1. Can it be done?
>
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