DLMF:19.8#Ex21 (Q6235)

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DLMF:19.8#Ex21
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    Δ = 1 - k 2 sin 2 ϕ . Δ 1 superscript 𝑘 2 2 italic-ϕ {\displaystyle{\displaystyle\Delta=\sqrt{1-k^{2}{\sin^{2}}\phi}.}}
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    DLMF:19.8#Ex21
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