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: