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Math Help - differentiability at x=0

  1. #1
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    differentiability at x=0

    A value of  k such that f(x)= x^ k is (n-1) -times

    differentiable at 0 but not (n) -times differentiable at

    0 is .
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  2. #2
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    Hint:
    x^{4/3} is differentiable at 0.
    x^{1/3} is not differentiable at 0.
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