Comment #12 on issue 2247 by [email protected]: Problem with coth http://code.google.com/p/sympy/issues/detail?id=2247
Dear, you should understand what Rieman surface is, and the possibility to cut it in several ways. Unfortunately I can't teach you. You should get a course of complex analysis.
About your question - it is not right to fix a foliation if you are using symbolic computation so formulas in Comment 1 are being legal see explanation in Comment 2, Comment 3. When you use numeric computation however, you should fix the foliation leaf to get result (look the Comment 3 for details).
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