Comment #4 on issue 1321 by Vinzent.Steinberg: trigonometric functions of
floating-point numbers should return floating-point numbers
http://code.google.com/p/sympy/issues/detail?id=1321
Interpreting sin('0.1') as "about 0.1" is ok, but for sin(0.1) it's wrong,
because
sympy can't distinguish 0.1 and 0.100000000.
I'm fine with the current behavior (assuming full float precision for
floats).
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