DLMF:22.16.E13 (Q7132)

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DLMF:22.16.E13
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    cn ( x , k ) = cos ϕ = cos ( am ( x , k ) ) . Jacobi-elliptic-cn 𝑥 𝑘 italic-ϕ Jacobi-elliptic-amplitude 𝑥 𝑘 {\displaystyle{\displaystyle\operatorname{cn}\left(x,k\right)=\cos\phi=\cos% \left(\operatorname{am}\left(x,k\right)\right).}}
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