How to find the residue at an essential singularity

Question:How to find the residue at an essential singularity

Posted: ssssazxsdfzcas 10 Product: Maple

6 hours ago

residue(z^3*cos(1/(z - 2)), z = 2);

                  3       1
         residue(z  cos(-----), z = 2)
                        z - 2

l notice the help document asks me to increse the n，but the n of essential singularity is infinity

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