Comment #5 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.
That's known and documented behaviour.
-->8--
Note: when n != None, if an O() term is returned then the x in the
in it and the entire expression represents x - x0, the displacement
from x0. (If there is no O() term then the series was exact and x has
it's normal meaning.) This is currently necessary since sympy's O()
can only represent terms at x0=0.
-->8--
which is not only wrong
It's not wrong. It's a shifted series, just as documented:
-->8--
the following is returned instead::
-x*sin(1) + cos(1) + O(x**2)
-->8--
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