Comment #98 on issue 1694 by nicolas.pourcelot: solve has many issues with
fractions
http://code.google.com/p/sympy/issues/detail?id=1694
Yet another digression:
"Aaron implemented metrics for this"
Then maybe we could use it for simplify too, since there is some case where
simplify result is much more complicated than its input value (that's why
checksol() was initially so slow in some cases).
In interactive mode, this is not a problem, but simplify is often used
inside other function.
So, if output value is more complicated, it may be better that simplify
simply returns input value (at least by default).
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