DLMF:4.35.E3 (Q1877)

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DLMF:4.35.E3
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    tanh ( u ± v ) = tanh u ± tanh v 1 ± tanh u tanh v , plus-or-minus 𝑢 𝑣 plus-or-minus 𝑢 𝑣 plus-or-minus 1 𝑢 𝑣 {\displaystyle{\displaystyle\tanh\left(u\pm v\right)=\frac{\tanh u\pm\tanh v}{% 1\pm\tanh u\tanh v},}}
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    DLMF:4.35.E3
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    tanh z 𝑧 {\displaystyle{\displaystyle\tanh\NVar{z}}}
    C4.S28.E4.m2adec
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