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Math Help - Calculating the second derivative of a function

  1. #1
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    Calculating the second derivative of a function

    If I know that a function f is differentiable over all the real numbers, and that 'a' is a real number, how can I show that

    f''\left( a \right) = \mathop {\lim }\limits_{h \to 0} \frac{{f\left( {a + h} \right) - 2f\left( a \right) + f\left( {a - h} \right)}}{{{h^2}}}?

    Here I am ssuming that f''(a) exists. The only way I can think of doing it is related to Taylor's Theorem, but we haven't done that on our course yet - I believe the L'Hospital Rule is to be used for solving this problem, but I'm not sure how to go about it.
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  2. #2
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    Apparently I can't edit my original post.

    I also know that f'\left( a \right) = \mathop {\lim }\limits_{h \to 0} \frac{{f\left( {a + h} \right) - f\left( a \right)}}{h}, but I don't know how to work this into using LHR in the same question.
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