(x) = cosx + sinx function; (Table attached in to description) table is given. a) Find the Lagrange interpolation polynomial P2(x) interpolating the function f(x). b) Using this polynomial, calculate the values of f(pi / 12 = 0.2618) and P2(pi / 12 = 0.2618) with seven digits after the comma. c) Determine an error upper limit for R2(

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