Status: Valid
Owner: ----
Labels: Type-Defect Priority-Medium Series WrongResult
New issue 3900 by [email protected]: lseries expansion is wrong
http://code.google.com/p/sympy/issues/detail?id=3900
In [30]: [i for i in tanh(x).lseries(x, 1)]
Out[30]:
⎡ 2 ⎤
⎣tanh(1), x - (x - 1)⋅tanh (1) - 1⎦
The second term is not of the form a*(x - 1)**n, which is why the series
terminates.
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