Question

Which of the following is the Maclaurin series for the function f (x) =cos-x 7
a) (-1)+" Σ 22n x2n A Σ 2 (2n)!
b) (-1) +" Σ 22n-1x2n+1 B (2n + 1)!
c) (-1) +" Σ 22n-1x2n C (2n)!
d) (-1) +" Σ 22n-1x2n D (2n)!
e) (-1) +" Σ 22n x2n +1 E (2n + 1)!