DLMF:22.7.E3 (Q6959)

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DLMF:22.7.E3
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    cn ( z , k ) = cn ( z / ( 1 + k 1 ) , k 1 ) dn ( z / ( 1 + k 1 ) , k 1 ) 1 + k 1 sn 2 ( z / ( 1 + k 1 ) , k 1 ) , Jacobi-elliptic-cn 𝑧 𝑘 Jacobi-elliptic-cn 𝑧 1 subscript 𝑘 1 subscript 𝑘 1 Jacobi-elliptic-dn 𝑧 1 subscript 𝑘 1 subscript 𝑘 1 1 subscript 𝑘 1 Jacobi-elliptic-sn 2 𝑧 1 subscript 𝑘 1 subscript 𝑘 1 {\displaystyle{\displaystyle\operatorname{cn}\left(z,k\right)=\frac{% \operatorname{cn}\left(z/(1+k_{1}),k_{1}\right)\operatorname{dn}\left(z/(1+k_{% 1}),k_{1}\right)}{1+k_{1}{\operatorname{sn}^{2}}\left(z/(1+k_{1}),k_{1}\right)% },}}
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    DLMF:22.7.E3
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    cn ( z , k ) Jacobi-elliptic-cn 𝑧 𝑘 {\displaystyle{\displaystyle\operatorname{cn}\left(\NVar{z},\NVar{k}\right)}}
    C22.S2.E5.m2adec
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    dn ( z , k ) Jacobi-elliptic-dn 𝑧 𝑘 {\displaystyle{\displaystyle\operatorname{dn}\left(\NVar{z},\NVar{k}\right)}}
    C22.S2.E6.m2adec
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