5. Using the trig identity cos(A + B) = cos(A) cos(B) - sin(A) sin (B) from the appendix, show from the definition of the derivative that the derivative of cos(x) is given by -- cos(x) = -sin(x). 6. From the figure at the right, read off the components of each of the vectors, 72 and f, and using the Vector Plot 2 components, calculate the displacement vector F2 - 1, and draw it in the figure. 15 1 2 > 0.5 -1 -05 0.5 1.5 2