Updates:
Labels: NeedsReview
Comment #1 on issue 1837 by smichr: 0**(x-2) becomes (oo)**(2-x)
http://code.google.com/p/sympy/issues/detail?id=1837
commit 1837 in smichr's 1766 branch at github retains the above behavior
but doesn't
let the exponent and multinomial expansions obliterate the exponent when
the base is
0. 0**(2-x) has an easily identifiable value of 1 when x=2, but if this
becomes
0**2*0**-x = 0*oo**x = 0, one can no longer determine when it is not 0.
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