DLMF:19.25#Ex6 (Q6527)

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DLMF:19.25#Ex6
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    ϕ = arccos x / z = arcsin ( z - x ) / z , italic-ϕ 𝑥 𝑧 𝑧 𝑥 𝑧 {\displaystyle{\displaystyle\phi=\operatorname{arccos}\sqrt{\ifrac{x}{z}}=% \operatorname{arcsin}\sqrt{\ifrac{(z-x)}{z}},}}
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