Comment #6 on issue 3109 by [email protected]: sqrt(exp(4*a)) != exp(2*a)
http://code.google.com/p/sympy/issues/detail?id=3109
Mul._eval_power also has an error that leads to the following failure:
>>> e=-sqrt(3)*(1+2*I)
>>> sqrt(e.n()).n()
1.03463339851334 - 1.6740720046904*I
>>> sqrt(e).n()
-1.03463339851334 + 1.6740720046904*I
>>> sqrt(e)
3**(1/4)*I*sqrt(1 + 2*I)
The negative sign should have been left inside. This is also fixed in
https://github.com/sympy/sympy/pull/1105
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