5. Represent f(x) = cosx as the sum of its Taylor 5 . (10 points) series at It/ 6. (Hint: f (x) = En=o 10. f () (a) n ! (x - a)n ( x - a ) + 1"(a) ( x - a) 2 + (@ (x - a)3 +. . . ) = f(a) + (a) 3! 1 ! 2