Problem #4: Let f(x) = cosx. Which of the following would you use to calculate f'(/2) using the definition of derivative (i.e., [3 marks] first principles)? (A) lim cos(-1/2 + h) h (B) lim sin(-7/2 + h) +1 (D) lim sin(1/2 + h) - 1 h cos(w/2 th) (C) lim h h sin(1/2 + h) (E) lim cos(-1/2 + h) -1 (F) lim sin(-7/2 + h) (G) lim cos(7/2 + h) + 1 (H) lim h h h Problem #4: Select v