Updates:
        Status: Fixed

Comment #4 on issue 1427 by [email protected]: subs for sqrt(a/b) is  
wrong
http://code.google.com/p/sympy/issues/detail?id=1427

This seems to have been fixed at some point (at the same time as issue  
896?):
In [34]: sqrt(x/y)
Out[34]:
     ⎽⎽⎽
    ╱ x
   ╱  ─
╲╱   y

In [37]: sqrt(x/y).subs({x:-2, y:-S(1)/2})
Out[37]: 2


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