DLMF:4.21.E19 (Q1721)

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DLMF:4.21.E19
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    Statements

    test
    cos 2 ⁡ u - cos 2 ⁡ v = - sin ⁡ ( u + v ) ⁢ sin ⁡ ( u - v ) , 2 𝑢 2 𝑣 𝑢 𝑣 𝑢 𝑣 {\displaystyle{\displaystyle{\cos^{2}}u-{\cos^{2}}v=-\sin\left(u+v\right)\sin% \left(u-v\right),}}
    0 references
    DLMF id
    DLMF:4.21.E19
    0 references
    Symbols used
    cosine function
    test
    cos ⁡ z 𝑧 {\displaystyle{\displaystyle\cos\NVar{z}}}
    xml-id
    C4.S14.E2.m2aldec
    0 references
     
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