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Answer to Question #8752 in Real Analysis for Joen

Question #8752
Find an approximation to f''(x) using f(x), f(x+h), and f(x+3h).
Expert's answer
f"(x) = [ f(x) - 2f(x+h) + f(x+2h) ] / h² + O(h).

For proof, see http://www.geometrictools.com/Documentation/FiniteDifferences.pdf

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