DLMF:19.11#Ex11 (Q6291)

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DLMF:19.11#Ex11
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    Defining formula
    tan ⁡ ( 1 2 ⁢ ψ ) = ( tan ⁡ θ ) ⁢ Δ ⁢ ( θ ) , 1 2 𝜓 𝜃 Δ 𝜃 {\displaystyle{\displaystyle\tan\left(\tfrac{1}{2}\psi\right)=(\tan\theta)% \Delta(\theta),}}
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    DLMF id
    DLMF:19.11#Ex11
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