Using the Lagrange interpolating polynomial with n = 3 find the interpolating polynomial for u(x) x = [1,2], P3(x) b) = The error can be written as = E3 = b(x)εm, 1≤≤2. Use the error formula to calculate c) m = b(x) = Using your answer from part b) calculate an upper bound for the error at x = 3: E = upper bound Calculate the exact error at æ = E3 = for

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