Which may be derived as a Maclaurin series for cot z -1/z The isolated singularity at the origin is a pole of order one (given by the number of negative powers in the expansion). Spot the pole of order five later.
Which may be derived as a Maclaurin series for cot z -1/z The isolated singularity at the origin is a pole of order one (given by the number of negative powers in the expansion). Spot the pole of order five later.