DLMF:19.11#Ex4 (Q6276)

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DLMF:19.11#Ex4
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    Defining formula
    tan ⁡ ( 1 2 ⁢ ψ ) = ( sin ⁡ θ ) ⁢ Δ ⁢ ( ϕ ) + ( sin ⁡ ϕ ) ⁢ Δ ⁢ ( θ ) cos ⁡ θ + cos ⁡ ϕ . 1 2 𝜓 𝜃 Δ italic-ϕ italic-ϕ Δ 𝜃 𝜃 italic-ϕ {\displaystyle{\displaystyle\tan\left(\tfrac{1}{2}\psi\right)=\frac{(\sin% \theta)\Delta(\phi)+(\sin\phi)\Delta(\theta)}{\cos\theta+\cos\phi}.}}
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    DLMF id
    DLMF:19.11#Ex4
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