DLMF:3.5#Ex12 (Q1270)

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DLMF:3.5#Ex12
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    Defining formula
    x k = ± cos ⁡ ( 2 ⁢ k 2 ⁢ n + 1 ⁢ π ) , subscript 𝑥 𝑘 plus-or-minus 2 𝑘 2 𝑛 1 {\displaystyle{\displaystyle x_{k}=\pm\cos\left(\frac{2k}{2n+1}\pi\right),}}
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    DLMF:3.5#Ex12
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