# Sech

## Description

The sech(x) function returns hyperbolic secant of x. An absolute value larger than about 710 is computationally out of bounds and returns missing value.

## Syntax

double sech(double x)

## Parameter

x

can be any real number. An absolute value larger than about 710 is computationally out of bounds and returns missing value.

## Return

Returns hyperbolic secant of x.

## Example

aa = sech(10);
aa = ; //should return 9.0799859337817E-5