DLMF:4.35.E40 (Q1914)

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DLMF:4.35.E40
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    test
    | tanh ⁡ z | = ( cosh ⁡ ( 2 ⁢ x ) - cos ⁡ ( 2 ⁢ y ) cosh ⁡ ( 2 ⁢ x ) + cos ⁡ ( 2 ⁢ y ) ) 1 / 2 . 𝑧 superscript 2 𝑥 2 𝑦 2 𝑥 2 𝑦 1 2 {\displaystyle{\displaystyle|\tanh z|=\left(\frac{\cosh\left(2x\right)-\cos% \left(2y\right)}{\cosh\left(2x\right)+\cos\left(2y\right)}\right)^{1/2}.}}
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    DLMF id
    DLMF:4.35.E40
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