DLMF:22.20#Ex6 (Q7192)

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DLMF:22.20#Ex6
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    Statements

    Defining formula
    dn ⁡ ( x , k ) = cos ⁡ ϕ 0 cos ⁡ ( ϕ 1 - ϕ 0 ) , Jacobi-elliptic-dn 𝑥 𝑘 subscript italic-ϕ 0 subscript italic-ϕ 1 subscript italic-ϕ 0 {\displaystyle{\displaystyle\operatorname{dn}\left(x,k\right)=\frac{\cos\phi_{% 0}}{\cos\left(\phi_{1}-\phi_{0}\right)},}}
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    DLMF id
    DLMF:22.20#Ex6
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