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[" 7.Prove that "sin^(2)(pi)/(18)+sin^(2...

[" 7.Prove that "sin^(2)(pi)/(18)+sin^(2)(1)/(18)+sin18],[" 8.Find the value of "cos^(2)(pi)/(16)+cos^(2)(3 pi)/(16)+cos^(2)(5 pi)/(16)+cos^(2)(7 pi)/(16)]

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