Comment #4 on issue 3106 by [email protected]: zoo*zoo == nan http://code.google.com/p/sympy/issues/detail?id=3106
That is to say, what you think they should be is wrong. 0 + 0*I should be 0, which is not the same as zoo. -zoo == zoo (because it represents *all* points at infinity in the complex plane), so the second one is right as well.
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