DLMF:22.13.E13 (Q7064)

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DLMF:22.13.E13
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    d 2 d z 2 sn ( z , k ) = - ( 1 + k 2 ) sn ( z , k ) + 2 k 2 sn 3 ( z , k ) , derivative 𝑧 2 Jacobi-elliptic-sn 𝑧 𝑘 1 superscript 𝑘 2 Jacobi-elliptic-sn 𝑧 𝑘 2 superscript 𝑘 2 Jacobi-elliptic-sn 3 𝑧 𝑘 {\displaystyle{\displaystyle\frac{{\mathrm{d}}^{2}}{{\mathrm{d}z}^{2}}% \operatorname{sn}\left(z,k\right)=-(1+k^{2})\operatorname{sn}\left(z,k\right)+% 2k^{2}{\operatorname{sn}^{3}}\left(z,k\right),}}
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