DLMF:4.21.E20 (Q1722)

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DLMF:4.21.E20
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    Statements

    Defining formula
    cos 2 ⁡ u - sin 2 ⁡ v = cos ⁡ ( u + v ) ⁢ cos ⁡ ( u - v ) . 2 𝑢 2 𝑣 𝑢 𝑣 𝑢 𝑣 {\displaystyle{\displaystyle{\cos^{2}}u-{\sin^{2}}v=\cos\left(u+v\right)\cos% \left(u-v\right).}}
    0 references
    DLMF id
    DLMF:4.21.E20
    0 references
    Symbols used
    cosine function
    Defining formula
    cos ⁡ z 𝑧 {\displaystyle{\displaystyle\cos\NVar{z}}}
    xml-id
    C4.S14.E2.m2amdec
    0 references
    sine function
    Defining formula
    sin ⁡ z 𝑧 {\displaystyle{\displaystyle\sin\NVar{z}}}
    xml-id
    C4.S14.E1.m2amdec
    0 references
     
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