Updates:
Cc: fredrik.johansson
Comment #1 on issue 1857 by Vinzent.Steinberg: evalf/simplify accuracy
http://code.google.com/p/sympy/issues/detail?id=1857
This is because each Real object has his own precision, which you have to
specify
unless you want to get a very low one. See [1]. Using Real('<number>', 100)
solves your
problem.
You might argue that the precision should be set globally to avoid such
confusion, like
it is done actually in mpmath.
[1] http://docs.sympy.org/modules/evalf.html#floating-point-numbers
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