Find the Riemann sum for f (x) = sin (x) over the interval [0, 2π], where x0 = 0, x1 = π/4, x2 = π/3, x3 = π, and x4 = 2π, and where c1 = π/6, c2 = π/3, c3 = 2π/3, and c4 = 3π/2. (Round your answer to three decimal places.)

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