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DLMF:30.14#Ex1 - MaRDI portal

DLMF:30.14#Ex1 (Q9622)

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DLMF:30.14#Ex1
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    x = c ( ξ 2 + 1 ) ( 1 - η 2 ) cos ϕ , 𝑥 𝑐 superscript 𝜉 2 1 1 superscript 𝜂 2 italic-ϕ {\displaystyle{\displaystyle x=c\sqrt{(\xi^{2}+1)(1-\eta^{2})}\cos\phi,}}
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