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Lagrange and Simpson's

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Compute the Lagrange interpolating polynomial L(x) for the function f(x)

f (x) = √(cos(ax)) a = 1.1125

passing through the points (0, f(0)), (0.5, f(0.5)) and (1, f(1)). Let S1 be the first Simpson' rule approximation to

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Problems regarding Lagrange and Simpson's rules

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