DLMF:4.21.E31 (Q1733)

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DLMF:4.21.E31
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    Statements

    Defining formula
    cos ⁡ ( 3 ⁢ z ) = - 3 ⁢ cos ⁡ z + 4 ⁢ cos 3 ⁡ z , 3 𝑧 3 𝑧 4 3 𝑧 {\displaystyle{\displaystyle\cos\left(3z\right)=-3\cos z+4{\cos^{3}}z,}}
    0 references
    DLMF id
    DLMF:4.21.E31
    0 references
    Symbols used
    cosine function
    Defining formula
    cos ⁡ z 𝑧 {\displaystyle{\displaystyle\cos\NVar{z}}}
    xml-id
    C4.S14.E2.m2atdec
    0 references
     
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