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),}}
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    DLMF id
    DLMF:4.21.E19
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