This exercise concerns deriving finite difference approximations of derivatives.
(a) Derive a(2) approximation of ’(j) that uses(j),(j−1), and(j+2).
(b) Derive a(2) approximation of ’(j) that uses(j),(j−1), and(j+2).
(c) Derive a(2) approximation of ’(j) that uses(j),(j−1), and(j+2). Also, explain how your answer can also be obtained from one of the formulas in Table 7.1.
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