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4-23.
  1. For parts (a) and (b) below, trace f(x) on your paper. Then, using a different color pencil or highlighter, sketch the graph of y = f ′(x) for the function given. Homework Help ✎

f(x) has a cusp at x = 3, so x '(x) should have a jump at
x = 3.

The max and min on a smooth continuous graph are the location of zeros on the derivative graph.