DLMF:4.42.E2 (Q1990)

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DLMF:4.42.E2
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    Statements

    test
    cos ⁡ A = b c = 1 sec ⁡ A , 𝐴 𝑏 𝑐 1 𝐴 {\displaystyle{\displaystyle\cos A=\frac{b}{c}=\frac{1}{\sec A},}}
    0 references
    DLMF id
    DLMF:4.42.E2
    0 references
    Symbols used
    cosine function
    test
    cos ⁡ z 𝑧 {\displaystyle{\displaystyle\cos\NVar{z}}}
    xml-id
    C4.S14.E2.m2adec
    0 references
    secant function
    test
    sec ⁡ z 𝑧 {\displaystyle{\displaystyle\sec\NVar{z}}}
    xml-id
    C4.S14.E6.m2adec
    0 references
    Q11254
    test
    A 𝐴 {\displaystyle{\displaystyle A}}
    xml-id
    C4.S42.XMD1.m1bdec
    0 references
    Q11257
    test
    b 𝑏 {\displaystyle{\displaystyle b}}
    xml-id
    C4.S42.XMD5.m1adec
    0 references
    Q11256
    test
    c 𝑐 {\displaystyle{\displaystyle c}}
    xml-id
    C4.S42.XMD6.m1bdec
    0 references
     
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