Comment #2 on issue 3019 by [email protected]: wrong result of expression: 2**(1/2)=1
http://code.google.com/p/sympy/issues/detail?id=3019
Or pass the expression as a string to sympify, like sympify("2**(1/2)") or S("2**(1/2)") (S is a shortcut for sympify). See also http://docs.sympy.org/0.7.1/gotchas.html#python-numbers-vs-sympy-numbers.
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