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Comment #5 on issue 3109 by smi...@gmail.com: sqrt(exp(4*a)) != exp(2*a)
http://code.google.com/p/sympy/issues/detail?id=3109
There are problems with how Pow.as_numer_denom works that leads to the
following error:
>>> print filldedent(str(m3))
-1484/375 - 4*(-12459439/52734375 + 114*sqrt(12657)/78125)**(1/3) -
172564/(140625*(-12459439/52734375 + 114*sqrt(12657)/78125)**(1/3))
>>> sqrt(m3).n()
0.221187120060844 + 2.51253478736008*I
>>> n,d=sqrt(m3).as_numer_denom()
>>> (n/d).n()
-0.221187120060844 - 2.51253478736008*I
This has also been fixed in https://github.com/sympy/sympy/pull/1105
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