DLMF:4.21.E6 (Q1708)

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DLMF:4.21.E6
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    sin u + sin v = 2 sin ( u + v 2 ) cos ( u - v 2 ) , 𝑢 𝑣 2 𝑢 𝑣 2 𝑢 𝑣 2 {\displaystyle{\displaystyle\sin u+\sin v=2\sin\left(\frac{u+v}{2}\right)\cos% \left(\frac{u-v}{2}\right),}}
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