Comment #3 on issue 1767 by smichr: separatevars(-sqrt(y + y*x), (y, x))
doesn't work
http://code.google.com/p/sympy/issues/detail?id=1767
Without knowing anything about the sign of x and y, it shouldn't pull
anything out of
the expression of comment 1. But if you know that y is positive then it
works:
>>> y=p=Symbol('p',positive=True)
>>> separatevars(-sqrt(p + p*x))
-p**(1/2)*(1 + x)**(1/2)
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