Can someone help me please
1. For each of the following functions, find the order of the pole that the
function has at the point a and find the residue.
(a) z−3/[(z−1)(z−2)] , a = 2
(b) exp[iz]/z^6+1 , a = exp(ipie/6)
(c) z^2/z^2+1 , a = i
(d) 1/(z−1)^3(z−2) , a = 1