Updates:
Summary: separatevars should use expand [was: expand(power_base=True) is too aggressive]

Comment #71 on issue 1766 by smi...@gmail.com: separatevars should use expand [was: expand(power_base=True) is too aggressive]
http://code.google.com/p/sympy/issues/detail?id=1766

I'm just changing the name on this since separatevars is doing its own thing rather than using the expand to control what happens.

    h[2] >>> sqrt(x*(1+y)).expand(mul=False, power_base=True)
    (x*(1 + y))**(1/2)
    h[3] >>> separatevars(_)
    x**(1/2)*(1 + y)**(1/2)

It, too, should get a force argument, I suppose.

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