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13 July, 17:17

F (x) = |x - 1| find the derivative from the left at x = 1. if it does not exist, enter none.

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  1. 13 July, 18:58
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    Given: f (x) = |x - 1|

    A graph of the function is shown below.

    The function is either

    f (x) = x-1, for x>1

    or

    f (x) = 1-x, for x<1

    Therefore

    f' (x) = 1, for x>1

    and

    f' (x) = - 1, for x<1

    Answer: - 1
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