DLMF:19.11#Ex1 (Q6273)

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DLMF:19.11#Ex1
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    Defining formula
    sin ⁡ ψ = ( sin ⁡ θ ⁢ cos ⁡ ϕ ) ⁢ Δ ⁢ ( ϕ ) + ( sin ⁡ ϕ ⁢ cos ⁡ θ ) ⁢ Δ ⁢ ( θ ) 1 - k 2 ⁢ sin 2 ⁡ θ ⁢ sin 2 ⁡ ϕ , 𝜓 𝜃 italic-ϕ Δ italic-ϕ italic-ϕ 𝜃 Δ 𝜃 1 superscript 𝑘 2 2 𝜃 2 italic-ϕ {\displaystyle{\displaystyle\sin\psi=\frac{(\sin\theta\cos\phi)\Delta(\phi)+(% \sin\phi\cos\theta)\Delta(\theta)}{1-k^{2}{\sin^{2}}\theta{\sin^{2}}\phi},}}
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    DLMF id
    DLMF:19.11#Ex1
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