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5.34.4  The residue of an expression at a point : residue

residue takes as argument an expression depending on a variable, the variable name and a complex a or an expression depending on a variable and the equality : variable_name=a. residue returns the residue of this expression at the point a.
Input :

residue(cos(x)/x^3,x,0)

or :

residue(cos(x)/x^3,x=0)

Output :

(-1)/2

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