Comment #6 on issue 1985 by [email protected]: as_real_imag() gives wrong answer when expanding quotient
http://code.google.com/p/sympy/issues/detail?id=1985
Playing with it a bit more, looks like ask(expr, Q.real) works well in this case, and could be used the way Aaron said. I'll write a patch and see if the tests work.
The other way, taking code from _eval_expand_complex(), doesn't look promising, this function is actually a method implemented by operators, so it's scattered over several files, and at some point all of them use as_real_imag() internally. This is also a good reason not to remove the function in the first place.
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