Please answer fast

(a) Use differentiation to find a power series representation for 1 f(I) = (7+ I ) 2 f(z) = > n=0 What is the radius of convergence, R? R = (b) Use part (a) to find a power series for f(x) = - (7 + 20 ) 3 f(x) = X n=0 What is the radius of convergence, R? R = (c) Use part (b) to find a power series for f (z) = 2 (7 + 20) 3 f(z) = E n= 0 What is the radius of convergence, R? R =