DLMF:4.21.E33 (Q1735)

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DLMF:4.21.E33
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    Statements

    test
    cos ⁡ ( 4 ⁢ z ) = 8 ⁢ cos 4 ⁡ z - 8 ⁢ cos 2 ⁡ z + 1 . 4 𝑧 8 4 𝑧 8 2 𝑧 1 {\displaystyle{\displaystyle\cos\left(4z\right)=8{\cos^{4}}z-8{\cos^{2}}z+1.}}
    0 references
    DLMF id
    DLMF:4.21.E33
    0 references
    Symbols used
    cosine function
    test
    cos ⁡ z 𝑧 {\displaystyle{\displaystyle\cos\NVar{z}}}
    xml-id
    C4.S14.E2.m2avdec
    0 references
    Q11217
    test
    z 𝑧 {\displaystyle{\displaystyle z}}
    xml-id
    C4.S1.XMD8.m1odec
    0 references
     
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