DLMF:36.4#Ex11 (Q9887)

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DLMF:36.4#Ex11
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    Defining formula
    x = 1 3 ⁢ z 2 ⁢ ( - cos ⁡ ( 2 ⁢ ϕ ) - 2 ⁢ cos ⁡ ϕ ) , 𝑥 1 3 superscript 𝑧 2 2 italic-ϕ 2 italic-ϕ {\displaystyle{\displaystyle x=\tfrac{1}{3}z^{2}(-\cos\left(2\phi\right)-2\cos% \phi),}}
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    DLMF id
    DLMF:36.4#Ex11
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