hyperbolic secant

hyperbolic secant (plural hyperbolic secants)

1. (mathematics) A hyperbolic function that is written in symbol sech and defined as the following:

   ${\displaystyle \operatorname {sech} (x)={\frac {1}{\cosh(x)}}={\frac {2}{e^{x}+e^{-x}}}}$.

• hyperbolic cosine