Comment #4 on issue 2362 by smi...@gmail.com: subs or N has an issue with
quartic root
http://code.google.com/p/sympy/issues/detail?id=2362
If the answer is expanded with complex=True, zero is also obtained after
substitution:
>>> eq.subs(u,ans[3]).n()
.0e-90 + 8.02995128223089*I
>>> eq.subs(u,ans[3].expand(complex=1)).n()
.0e-127 + .0e-127*I
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