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[" 18."sin36^(@)sin72^(@)sin108^(@)sin14...

[" 18."sin36^(@)sin72^(@)sin108^(@)sin144^(@)" is equal to "],[[" (1) "(1)/(4)," (2) "(1)/(16)],[" (3) "(3)/(4)]]

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sin36^(@)sin72^(@)sin108^(@)sin144^(@)=(5)/(16)

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