(a)Copy the graph of the given function f. (Note that the explicit form of f is intentionally not provided.) The derivative can be interpretated as the slope of the graph (you may refer to Stewart's calculus (9th edition) book example 1 in section 2.8 (page 153)). Below the graph of f, sketch the graph of f' showing the zeros and the turning points clearly with their coordinates. The sketch should have the correct general shape; you do not need to use graph paper. You must justify the shape of your graph with some working. y Sketch of f