DLMF:4.21.E25 (Q1727)

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DLMF:4.21.E25
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    Statements

    Defining formula
    cos ⁡ ( - z ) = cos ⁡ z , 𝑧 𝑧 {\displaystyle{\displaystyle\cos\left(-z\right)=\cos z,}}
    0 references
    DLMF id
    DLMF:4.21.E25
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    Symbols used
    cosine function
    Defining formula
    cos ⁡ z 𝑧 {\displaystyle{\displaystyle\cos\NVar{z}}}
    xml-id
    C4.S14.E2.m2aqdec
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    Q11217
    Defining formula
    z 𝑧 {\displaystyle{\displaystyle z}}
    xml-id
    C4.S1.XMD8.m1gdec
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