DLMF:4.35.E19 (Q1893)

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DLMF:4.35.E19
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    sinh 2 u + cosh 2 v = cosh ( u + v ) cosh ( u - v ) . 2 𝑢 2 𝑣 𝑢 𝑣 𝑢 𝑣 {\displaystyle{\displaystyle{\sinh^{2}}u+{\cosh^{2}}v=\cosh\left(u+v\right)% \cosh\left(u-v\right).}}
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