Comment #47 on issue 1766 by asmeurer: expand(power_base=True) is too
aggressive
http://code.google.com/p/sympy/issues/detail?id=1766
As for seperatevars((exp(2*x)-exp(2*y))/(exp(x)-exp(y)) == exp(x) +
exp(y)), that isn't really separated, unless we want to have it do
additive separation too (which should somehow be separate I think).
Otherwise, isn't that just the job of cancel? By the way, simplify
does it right in the new polys branch.
To answer you question in the commit message about the ODE test, it looks
like the 1766 fixed it somehow (based on a bisect).
# shouldn't this go to (z**y)**2 automatically?
I would rather have a function that does it than making it happen
automatically in Pow. Once something happens automatically, it is
impossible to make it not happen.
# you can only extract numbers of the same sign
What is the rational behind this?
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