13. Iff (u) = sec u , find f'(u) a. sec u tan u С. sec x tan x b. sec u tanu d. sec x tan x 14. Which of the following is a critical point of the function f ( x) cos x ? a. C. 2 b. d. 15. Which of the following is the maximum point of the function f(x) = x2-x on the interval -2, 2 J. (2, 2) (-2, 6) (2, 6) a. C. b. d. (2, -4)

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