Please answer both 2 and 3 thanks

(2) Write a matlab script that plots the function cos x on [0, 27) using 16 points, then plot it again with 32 and 64 points. Hint: first discretize the interval (0,21], let y = cos x and then plot the given function using plot(x,y) where x and y must be vectors of the same length. Use length(x) and length(y) to check. (3) Re-do problem using the function f(x) = 2 sin x + 3 sin 2x + 7 sin 3x + 5 sin 4x. Now plot f(x) as a figure and its derivative, f'(x) as another figure . Use matlab's function called subplot(nx,ny,n) where nx is the number of row and ny is the number of column (with nx x ny is total number of figures, and n is the nth figure)