(a) A student derived the following: f"(x) ≈ = f'(x + h) — f'(x - h) 2h 1 [f(x+h)-f(x) 2h h f(x) - f(x - h) -h)] h f(x+h) - 2f(x) + f (x − h) 2h² Is this correct or not? Justify your answer. (b) If the approximate formula in (a) is wrong, find a correct one with the order of error.

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