Comment #2 on issue 1583 by smi...@gmail.com: evalf doesn't evaluate arguments to functions if they have symbols
http://code.google.com/p/sympy/issues/detail?id=1583
Issue 2809 is similar in that even (3.0*pi).n() doesn't become a number. We've made functions containing floats evaluate; we should probably do the same with Muls or Adds involving numerical constants. I can't locate the discussion about that right now, however.
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