This question wants me to locate each of the isolated singularities of the given functions and tell whether it is a removable singularity, a pole, or an essential singularity. Also, if the singularity is removable, what is the value of the function at that point; if the singularity is a pole, what is the order of the pole?

(a)e2z22z23z+1

(b)1cos(z)1