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[" 3.Prove that "cot(pi)/(20)cot(3 pi)/(...

[" 3.Prove that "cot(pi)/(20)cot(3 pi)/(20)cot(5 pi)/(20)cot(7 pi)/(20)cot(9 pi)/(20)=1],[" 4.If "sin alpha+cos ec alpha=2" find the value "sin^(n)alpha+cos ec^(n)alpha(n in z^(+))]

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