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DLMF:19.11#Ex13 - MaRDI portal

DLMF:19.11#Ex13 (Q6989)

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DLMF:19.11#Ex13
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    cos θ = ( cos ψ ) + Δ ( ψ ) 1 + Δ ( ψ ) , 𝜃 𝜓 Δ 𝜓 1 Δ 𝜓 {\displaystyle{\displaystyle\cos\theta=\sqrt{\frac{(\cos\psi)+\Delta(\psi)}{1+% \Delta(\psi)}},}}
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