DLMF:22.6.E19 (Q6953)

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DLMF:22.6.E19
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    Statements

    sn 2 ( 1 2 z , k ) = 1 - cn ( z , k ) 1 + dn ( z , k ) = 1 - dn ( z , k ) k 2 ( 1 + cn ( z , k ) ) = dn ( z , k ) - k 2 cn ( z , k ) - k 2 k 2 ( dn ( z , k ) - cn ( z , k ) ) , Jacobi-elliptic-sn 2 1 2 𝑧 𝑘 1 Jacobi-elliptic-cn 𝑧 𝑘 1 Jacobi-elliptic-dn 𝑧 𝑘 1 Jacobi-elliptic-dn 𝑧 𝑘 superscript 𝑘 2 1 Jacobi-elliptic-cn 𝑧 𝑘 Jacobi-elliptic-dn 𝑧 𝑘 superscript 𝑘 2 Jacobi-elliptic-cn 𝑧 𝑘 superscript superscript 𝑘 2 superscript 𝑘 2 Jacobi-elliptic-dn 𝑧 𝑘 Jacobi-elliptic-cn 𝑧 𝑘 {\displaystyle{\displaystyle{\operatorname{sn}^{2}}\left(\tfrac{1}{2}z,k\right% )=\frac{1-\operatorname{cn}\left(z,k\right)}{1+\operatorname{dn}\left(z,k% \right)}=\frac{1-\operatorname{dn}\left(z,k\right)}{k^{2}(1+\operatorname{cn}% \left(z,k\right))}=\frac{\operatorname{dn}\left(z,k\right)-k^{2}\operatorname{% cn}\left(z,k\right)-{k^{\prime}}^{2}}{k^{2}(\operatorname{dn}\left(z,k\right)-% \operatorname{cn}\left(z,k\right))},}}
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    DLMF:22.6.E19
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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.m2afdec
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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.m2afdec
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    sn ( z , k ) Jacobi-elliptic-sn 𝑧 𝑘 {\displaystyle{\displaystyle\operatorname{sn}\left(\NVar{z},\NVar{k}\right)}}
    C22.S2.E4.m2afdec
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    z 𝑧 {\displaystyle{\displaystyle z}}
    C22.S1.XMD3.m1rdec
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    k 𝑘 {\displaystyle{\displaystyle k}}
    C22.S1.XMD4.m1rdec
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