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4-23.

For parts (a) and (b) below, trace $f(x)$ on your paper. Then, using a different color pencil or highlighter, sketch the graph of $y = f^\prime(x)$ for the function given.

1. $f(x)$ has a cusp at $x = 3$, so $x^\prime(x)$ should have a jump at $x = 3$.

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