Comment #33 on issue 2133 by matt...@gmail.com: Merge new polynomials manipulation module
http://code.google.com/p/sympy/issues/detail?id=2133
I tracked down this problem to implemented_function() from lambdify.py which modifies the global instance of a function when caching is enabled (see test_implemented_function_evalf from test_evalf.py).
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