Comment #3 on issue 2834 by [email protected]: naive radical removal can lead to multiplying by 0/0
http://code.google.com/p/sympy/issues/detail?id=2834
But...as has shown up in recent threads, this is a shortcoming of a CAS which should be thought of as a tool for the work.
So what I've done for now is to put a control flad in radsimp that allows symbolic transformations to be disallowed (symbolic=False) but it is on by default.
radsimp didn't have a test suite before and only a single test that tested that the method and function gave the same result. Now there is a test suite and more significant processing of radicals in the denominator. But it needs someone besides me (the author) to review it. Could someone take probably less than an hour and look this over? It's especially important that simplify not make a mistake with numbers that leads to an unevaluatable expression. (See comment 1 for links to the pull requests.)
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