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#### Search: #### Residue

Function: residue (<expr>, <z>, <z_0>) Computes the residue in the complex plane of the expression <expr> when the variable <z> assumes the value <z_0>. The residue is the coefficient of `(<z> - <z_0>)^(-1)` in the Laurent series for <expr>. ```          (%i1) residue (s/(s**2+a**2), s, a*%i);
1
(%o1)                           -
2
(%i2) residue (sin(a*x)/x**4, x, 0);
3
a
(%o2)                         - --
6```

```(%o1)                                true
(%i2) ```

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