Updates:
        Status: Fixed

Comment #4 on issue 2629 by smi...@gmail.com: Canonical powers
http://code.google.com/p/sympy/issues/detail?id=2629

OK, multivariate base combination is now possible with powsimp. Since non-commutative terms are ignored, this should not return invalid nc expressions:

    >>> A*B*sqrt(A*B)*x*y*sqrt(x*y)
    x*y*sqrt(x*y)*A*B*sqrt(A*B)
    >>> powsimp(_)
    (x*y)**(3/2)*A*B*sqrt(A*B)

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