Consider the function f (x) = cos aC ). Which of the following statements are true? OO a) cos( V la E (-1) n (2n)! for each r E R. n=0 b) E ( - 1) (2n)! is the Taylor series for f centered at x = 0. n=0 c) T3,0(20) = 1- 2 3 2 4! 6! d) f" (0) = -3! 6!' e) None of the above