A four-point formula for the derivative is Apply it to f(x) = x 4 with x 1

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A €œfour-point formula€ for the derivative is

(-2f1 – 3f2 + 6f3 – fa). f2 6h Apply it to f(x) = x4 with x1, · · ·, x4 as in Prob. 27, determine the error, and compare it with that in the case of (15).

Data from Prob. 27

Consider f(x) = x4 for x0 = 0, x1 = 0.2, x2 = 0.4, x3 = 0.6, x4 = 0.8. Calculate f'from (14a), (14b), (14c), (15). Determine the errors. Compare and comment.

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