 
 
 
13.5.4  Residue of an expression at a point
The residue command
finds the residue of an expression at a point.
- 
residue takes three arguments:
- 
expr, an expression depending on a variable.
- x, a variable name.
- a, a complex number. This can be combined with the previous
argument in an equality x=a.
 
- residue(expr,x,a)
returns the residue of expr at the point a.
Example
or:
 
 
