DLMF:4.42.E12 (Q2000)

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DLMF:4.42.E12
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    Statements

    Defining formula
    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.}}
    0 references
    DLMF id
    DLMF:4.42.E12
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    Symbols used
    cosine function
    Defining formula
    cos ⁡ z 𝑧 {\displaystyle{\displaystyle\cos\NVar{z}}}
    xml-id
    C4.S14.E2.m2afdec
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    sine function
    Defining formula
    sin ⁡ z 𝑧 {\displaystyle{\displaystyle\sin\NVar{z}}}
    xml-id
    C4.S14.E1.m2agdec
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    Q11265
    Defining formula
    A 𝐴 {\displaystyle{\displaystyle A}}
    xml-id
    C4.S42.XMD14.m1ddec
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    Q11269
    Defining formula
    B 𝐵 {\displaystyle{\displaystyle B}}
    xml-id
    C4.S42.XMD15.m1ddec
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    Q11270
    Defining formula
    C 𝐶 {\displaystyle{\displaystyle C}}
    xml-id
    C4.S42.XMD16.m1cdec
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    Q11266
    Defining formula
    a 𝑎 {\displaystyle{\displaystyle a}}
    xml-id
    C4.S42.XMD17.m1edec
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