(3k-3-sqrt(3)*(1-2*cos(2*Pi*(k-1)/3))*sin(2*Pi*(k-1)/3)))/9+1 where k=6(3k-3-sqrt(3)*(1-2*cos(2*Pi*(k-1)/3))*sin(2*Pi*(k-1)/3)))/9+1 where k=6

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