(pi / 6) * (sqrt(1 + cos(0)^2) + 4 * sqrt(1 + cos(pi / 2)^2) + sqrt(1 + cos(pi)^2))(pi / 6) * (sqrt(1 + cos(0)^2) + 4 * sqrt(1 + cos(pi / 2)^2) + sqrt(1 + cos(pi)^2))

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