# 3.5.1.2.6 Acsch

## Description

This function is used to return the inverse hyperbolic cosecant.

## Syntax

 double acsch(double x)

## Parameters

x

x is any real number except 0, which returns missing value. Note that any number whose absolute value is greater than ~3E153 is computationally out of bounds and will also return missing value.

## Return

Return the inverse hyperbolic cosecant of that number.

## Example

dd=acsch(-10);
dd=; //Should return -0.0998.