Question
Determine which complex function has simple pole,essential pole, pole of order n, and removable singularity? f(z)=\frac{\cos (z)}{z} f(z)=\frac{1}{(z-3)(z+1)^{3}} f(z)=\frac{e^{\frac{1}{z}}}{z}
Question image 1Question image 2Question image 3Question image 4