On the previous page, we learned how to use the graph of a function to determine where the function is NOT differentiable. At any given input value, a function is either differentiable or not differentiable. Consequently, it is often easier to first determine where a function is not differentiable, and then identify the intervals where the function is differentiable. Below is a graph of the function y = f(x). Determine where the function is differentiable. Explain your reasoning and write your answer in interval notation. 10 9 8 7 6 5+ 4 3 2 1 1 2 3 4 5 6 7 y = f (x) 8 9 10 X

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