DLMF:4.21.E15 (Q1717)

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DLMF:4.21.E15
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    Statements

    Defining formula
    2 ⁢ sin ⁡ u ⁢ sin ⁡ v = cos ⁡ ( u - v ) - cos ⁡ ( u + v ) , 2 𝑢 𝑣 𝑢 𝑣 𝑢 𝑣 {\displaystyle{\displaystyle 2\sin u\sin v=\cos\left(u-v\right)-\cos\left(u+v% \right),}}
    0 references
    DLMF id
    DLMF:4.21.E15
    0 references
    Symbols used
    cosine function
    Defining formula
    cos ⁡ z 𝑧 {\displaystyle{\displaystyle\cos\NVar{z}}}
    xml-id
    C4.S14.E2.m2aidec
    0 references
    sine function
    Defining formula
    sin ⁡ z 𝑧 {\displaystyle{\displaystyle\sin\NVar{z}}}
    xml-id
    C4.S14.E1.m2aidec
    0 references
     
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