Comment #2 on issue 2842 by waks...@gwax.com: evalf should not use
conjugate or expand if there are symbols; 1 should return as 1.0
http://code.google.com/p/sympy/issues/detail?id=2842
It is worth noting that the current behavior contradicts the documentation:
From http://docs.sympy.org/dev/modules/evalf.html : "If the expression
contains symbols or for some other reason cannot be evaluated numerically,
calling .evalf() or N() returns the original expression"
S(1)/(Symbol('n')+1)
1/(n + 1)
N(_)
conjugate(n)/(n*conjugate(n) + n + conjugate(n) + 1) + 1/(n*conjugate(n) +
n + conjugate(n) + 1)
simplify(_)
1/(n + 1)
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