DLMF:19.11#Ex13 (Q6293)

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DLMF:19.11#Ex13
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    Defining formula
    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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    DLMF id
    DLMF:19.11#Ex13
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