(a) Use differentiation to find a power series representation for f(x) = (7+ x) f(x) = nx n=0 What is the radius of convergence, R? (b) Use part (a) to find a power series for co f(x) 2.7n+3 n=0 What is the radius of convergence, R? (c) Use part (b) to find a power series for f(x) = (7+ x) n=2 What is the radius of convergence, R?