sech( z )
The hyperbolic secant of z in SageMath. The reciprocal of the hyperbolic cosine:
\[ \operatorname{sech} z = \frac{ 1 }{ \cosh z } \]Plot on the real axis:
Series expansion about the origin:
Special values:
Related functions: cosh arcsech asech
Function category: hyperbolic functions sagemath-docs