How do you sketch a derivative when you haven't been given the function?

The graph of f is shown in the figure. Sketch a graph of the derivative of f. 6 4- X -6 -4 4 6 -4 - 6 -8 4 4 4 21 2 X X X X - 6 -4 -2 2 4 6 - 6 -4 4 6 - 6 -4 -2 2 4 6 - 6 -4 -2 4 6 - 2 -2 -2 -4 -4 -4 -6 O O -64 O O - 6