DLMF:19.7#Ex17 (Q6198)

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DLMF:19.7#Ex17
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    sin θ = 1 + k 2 sin ϕ 1 + k 2 sin 2 ϕ , 𝜃 1 superscript 𝑘 2 italic-ϕ 1 superscript 𝑘 2 2 italic-ϕ {\displaystyle{\displaystyle\sin\theta=\frac{\sqrt{1+k^{2}}\sin\phi}{\sqrt{1+k% ^{2}{\sin^{2}}\phi}},}}
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    DLMF:19.7#Ex17
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