DLMF:4.42.E12 (Q2000)

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DLMF:4.42.E12
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    Statements

    test
    cos ⁡ A = - cos ⁡ B ⁢ cos ⁡ C + sin ⁡ B ⁢ sin ⁡ C ⁢ cos ⁡ a . 𝐴 𝐵 𝐶 𝐵 𝐶 𝑎 {\displaystyle{\displaystyle\cos A=-\cos B\cos C+\sin B\sin C\cos a.}}
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    DLMF id
    DLMF:4.42.E12
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