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[" (iii) "sin^(2)((n)/(8)+(n)/(2))-sin^(...

[" (iii) "sin^(2)((n)/(8)+(n)/(2))-sin^(2)((pi)/(8)-(pi)/(2))],[" Prove that "],[[" (i) "cos((3 pi)/(2)+x)cos(2 pi+x)[cot((3 pi)/(2)-x)+cot(2 pi+x)]=1]]

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