Problem #6: Let f(x) = cosx. Which of the following would you use to calculate f'(-7/2) using the definition of derivative (i.e., first principles)? (A) lim sin(7/2 + h) -1 (B) im sin( 7/2 + h) + 1 (D) lim cos(7/2 + h) h h (C) lim cos(7/2 + h) + 1 h-+ 0 h- C h h (E) lim sin(7/2 + h) (F) lim sin(/2 + h) cos( it/2 +. h) -1 (H) lim h h (G) lim cos( Tt/2 + h) h - h h Problem #6: Select v