Updates:
Summary: conjugate doesn't work for rational powers
Comment #2 on issue 1724 by [email protected]: conjugate doesn't work
for rational powers
http://code.google.com/p/sympy/issues/detail?id=1724
(-29/54 + 93**(1/2)/18) is negative, so its cubic root is complex. What you
observed
is correct, though confusing, with the exception of the last statement
which is a
genuine bug.
So, your main problem is an avatar of issue 216. Additionally, you've
encountered the
wrong result ((-1)**(S(1)/3)).conjugate() == ((-1)**(S(1)/3)).
PS: asmeurer's evaluation is incorrect, it's for expressions with
non-integer
rational powers that conjugate doesn't work, but they don't need to be
complicated.
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