Comment #1 on issue 1537 by ondrej.certik: There are certain cases of
inversed operations where it seems like sympy might do better reducing
http://code.google.com/p/sympy/issues/detail?id=1537
it's because sqrt(x**2) is not always equal to x. So you need to tell sympy
more
about your "x", for example:
In [1]: x = Symbol("x", positive=True)
In [2]: sqrt(x**2)
Out[2]: x
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