Comment #15 on issue 564 by asmeurer: series expansion of acosh and acoth http://code.google.com/p/sympy/issues/detail?id=564
Well, since symbols are complex by default in SymPy, I think it only makes sense for functions to be complex by default as well.
Someday, the new assumptions will make it easy to work only with the reals if you want. But until then, making things complex by default is the most general way to do it (e.g., if you only care about reals, you at least know that zoo means +/- oo).
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