DLMF:4.42.E11 (Q1999)

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DLMF:4.42.E11
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    Statements

    Defining formula
    cos ⁡ a ⁢ cos ⁡ C = sin ⁡ a ⁢ cot ⁡ b - sin ⁡ C ⁢ cot ⁡ B , 𝑎 𝐶 𝑎 𝑏 𝐶 𝐵 {\displaystyle{\displaystyle\cos a\cos C=\sin a\cot b-\sin C\cot B,}}
    0 references
    DLMF id
    DLMF:4.42.E11
    0 references
    Symbols used
    cosine function
    Defining formula
    cos ⁡ z 𝑧 {\displaystyle{\displaystyle\cos\NVar{z}}}
    xml-id
    C4.S14.E2.m2aedec
    0 references
    cotangent function
    Defining formula
    cot ⁡ z 𝑧 {\displaystyle{\displaystyle\cot\NVar{z}}}
    xml-id
    C4.S14.E7.m2aadec
    0 references
    sine function
    Defining formula
    sin ⁡ z 𝑧 {\displaystyle{\displaystyle\sin\NVar{z}}}
    xml-id
    C4.S14.E1.m2afdec
    0 references
    Q11269
    Defining formula
    B 𝐵 {\displaystyle{\displaystyle B}}
    xml-id
    C4.S42.XMD15.m1cdec
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    Q11270
    Defining formula
    C 𝐶 {\displaystyle{\displaystyle C}}
    xml-id
    C4.S42.XMD16.m1bdec
    0 references
    Q11266
    Defining formula
    a 𝑎 {\displaystyle{\displaystyle a}}
    xml-id
    C4.S42.XMD17.m1ddec
    0 references
     
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