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11-24.
  1. Multiple Choice: The function in non-differentiable at: Homework Help ✎

    1. −1

    2. 0

    3. 1

    4. −1, 1

    5. −1, 0, 1

To solve this algebraically, rewrite the function as a piecewise-defined function with three pieces.
Then take the derivative of each piece.
Decide whether or not the derivatives agree at the "breaking points".

Otherwise, look at the graph.