DLMF:4.35.E7 (Q1881)

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DLMF:4.35.E7
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    cosh u + cosh v = 2 cosh ( u + v 2 ) cosh ( u - v 2 ) , 𝑢 𝑣 2 𝑢 𝑣 2 𝑢 𝑣 2 {\displaystyle{\displaystyle\cosh u+\cosh v=2\cosh\left(\frac{u+v}{2}\right)% \cosh\left(\frac{u-v}{2}\right),}}
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