Comment #7 on issue 3052 by [email protected]: evaluating Abs should result in a positive number
http://code.google.com/p/sympy/issues/detail?id=3052
By the way, you may be interested in the examples given section 1.2 in Gruntz's thesis (I can email you the pdf if you can't find it). The last one in particular is interesting. Unless you use a precision that grows exponentially with x, you will get 0 (the expression is not identically zero). For example, for x = 22, you need 10**9 digits.
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