Comment #4 on issue 4132 by [email protected]: evaluating series() twice for
a generic function at a generic point fails
http://code.google.com/p/sympy/issues/detail?id=4132
Not sure what you mean it's not a bug. Here is the doc:
" sympy.series.series.series(expr, x=None, x0=0, n=6, dir='+')[source]
Series expansion of expr around point x=x0."
And here is an example in the doc when I type f.series?:
"cos(x).series(x0=1, n=2) --> (1 - x)*sin(1) + cos(1) + O((x - 1)**2)"
Yet, when I run that I get:
In [6]: cos(x).series(x0=1, n=2)
Out[6]: cos(1) - x*sin(1) + O(x**2)
which is not only wrong, but also does not match the documentation example.
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