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[" I Example 105.Evaluate "sum(r=1)^(n(i...

[" I Example 105.Evaluate "sum_(r=1)^(n_(i)=1)cos^(2)((r pi)/(hat pi)).],[" Sol.Sum "=(1)/(2)sum_(i=1)^(n-1)(1+cos(2 pi)/(n))]

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