DLMF:4.42.E8 (Q1996)

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DLMF:4.42.E8
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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,}}
    0 references
    DLMF id
    DLMF:4.42.E8
    0 references
    Symbols used
    cosine function
    test
    cos ⁡ z 𝑧 {\displaystyle{\displaystyle\cos\NVar{z}}}
    xml-id
    C4.S14.E2.m2acdec
    0 references
    sine function
    test
    sin ⁡ z 𝑧 {\displaystyle{\displaystyle\sin\NVar{z}}}
    xml-id
    C4.S14.E1.m2acdec
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    Q11265
    test
    A 𝐴 {\displaystyle{\displaystyle A}}
    xml-id
    C4.S42.XMD14.m1adec
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    Q11266
    test
    a 𝑎 {\displaystyle{\displaystyle a}}
    xml-id
    C4.S42.XMD17.m1adec
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    Q11267
    test
    b 𝑏 {\displaystyle{\displaystyle b}}
    xml-id
    C4.S42.XMD18.m1adec
    0 references
    Q11268
    test
    c 𝑐 {\displaystyle{\displaystyle c}}
    xml-id
    C4.S42.XMD19.m1adec
    0 references
     
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