DLMF:4.35.E12 (Q1886)

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DLMF:4.35.E12
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    Statements

    Defining formula
    sech 2 ⁡ z = 1 - tanh 2 ⁡ z , 2 𝑧 1 2 𝑧 {\displaystyle{\displaystyle{\operatorname{sech}^{2}}z=1-{\tanh^{2}}z,}}
    0 references
    DLMF id
    DLMF:4.35.E12
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    Symbols used
    hyperbolic secant function
    Defining formula
    sech ⁡ z 𝑧 {\displaystyle{\displaystyle\operatorname{sech}\NVar{z}}}
    xml-id
    C4.S28.E6.m2adec
    0 references
     
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