DLMF:3.5#Ex7 (Q1265)

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DLMF:3.5#Ex7
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    x k = cos ( 2 k - 1 2 n π ) , subscript 𝑥 𝑘 2 𝑘 1 2 𝑛 {\displaystyle{\displaystyle x_{k}=\cos\left(\frac{2k-1}{2n}\pi\right),}}
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