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Math Help - a problem about differentiability

  1. #1
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    a problem about differentiability

    i need your helps. thanks for everything.
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  2. #2
    Super Member girdav's Avatar
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    Re: a problem about differentiability

    Apply mean value theorem to get \min\{x_n,y_n\}\leq \xi_n\leq \max\{x_n,y_n\} such that f(x_n)-f(y_n)=f'(\xi_n)(x_n-y_n), and the squeeze theorem gives that \xi_n\to x_0. Now you can conclude.
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    Re: a problem about differentiability

    vaauuuv. thans bro. you so great.
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