Comment #6 on issue 3214 by ronan.l...@gmail.com: KeyError with radsimp() http://code.google.com/p/sympy/issues/detail?id=3214
Yes, you're right. The xreplace() technique works in a few more cases, but it's just as unreliable as using the dict directly. The only clear advantage (but is it really one?) is that it can never raise.
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