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sqrt((1+sqrt(5))/4*((3-\sqrt(5))/4)*((1+sqrt(5))/4-1/2)((1+sqrt(5))/4 + 1/2))
sqrt((1+sqrt(5))/4*((3-\sqrt(5))/4)*((1+sqrt(5))/4-1/2)((1+sqrt(5))/4 + 1/2))
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