Updates:
        Status: Fixed

Comment #2 on issue 849 by smi...@gmail.com: .expand(ratio=True)
http://code.google.com/p/sympy/issues/detail?id=849

eq=(x+y)*y/x/(z+y)
pprint(eq)
y*(x + y)
---------
x*(y + z)
eq.expand(frac=True)
(x*y + y**2)/(x*y + x*z)
eq.expand(numer=True)
(x*y + y**2)/(x*(y + z))
eq.expand(denom=True)
y*(x + y)/(x*y + x*z)
eq.expand()
x*y/(x*y + x*z) + y**2/(x*y + x*z)

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