DLMF:28.28#Ex6 (Q8444)

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DLMF:28.28#Ex6
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    e 2 i ϕ = cosh ( z + i t ) cosh ( z - i t ) , superscript 𝑒 2 imaginary-unit italic-ϕ 𝑧 imaginary-unit 𝑡 𝑧 imaginary-unit 𝑡 {\displaystyle{\displaystyle e^{2\mathrm{i}\phi}=\dfrac{\cosh\left(z+\mathrm{i% }t\right)}{\cosh\left(z-\mathrm{i}t\right)},}}
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