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This module implements the Residue function and related tools for working
with residues.
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Finds the residue of ``expr`` at the point x=x0.
The residue is defined as the coefficient of ``1/(x-x0)`` in the power series
expansion about ``x=x0``.
Examples
========
>>> from sympy import Symbol, residue, sin
>>> x = Symbol("x")
>>> residue(1/x, x, 0)
1
>>> residue(1/x**2, x, 0)
0
>>> residue(2/sin(x), x, 0)
2
This function is essential for the Residue Theorem [1].
References
==========
.. [1] https://en.wikipedia.org/wiki/Residue_theorem
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