DLMF:19.33#Ex1 (Q6700)

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DLMF:19.33#Ex1
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    Statements

    Defining formula
    cos ⁡ ϕ = c a , italic-ϕ 𝑐 𝑎 {\displaystyle{\displaystyle\cos\phi=\frac{c}{a},}}
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    DLMF id
    DLMF:19.33#Ex1
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