DLMF:4.34.E5 (Q1865)

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DLMF:4.34.E5
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    Statements

    test
    d d z ⁡ sech ⁡ z = - sech ⁡ z ⁢ tanh ⁡ z , derivative 𝑧 𝑧 𝑧 𝑧 {\displaystyle{\displaystyle\frac{\mathrm{d}}{\mathrm{d}z}\operatorname{sech}z% =-\operatorname{sech}z\tanh z,}}
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    DLMF id
    DLMF:4.34.E5
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