+00 In class you learned the MacLaurin series of cos r = )(-1)"- 2n (2n)! for all r in R, n=0 (a) (5 points) find the power series centered at 0 that converges to the function f(x) = r cos(3x2) for all real numbers. (b) (5 points) Write down the first few terms of the power series you obtain in part (a) to find f(0), the 5th derivative of f(r) at 0)