(arccos (1/3) + arccos ((1/3)/2 + sqrt(3-3(1/3)^2)/2)) - 2 arccos (1/3-pi/3)(arccos (1/3) + arccos ((1/3)/2 + sqrt(3-3(1/3)^2)/2)) - 2 arccos (1/3-pi/3)

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