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# Technical Reference: Base Operating System and Extensions, Volume 1

## casinh, casinfh, or casinlh Subroutine

### Purpose

Computes the complex arc hyperbolic sine.

### Syntax

#include <complex.h>
double complex casinh (z)
double complex z;
float complex casinhf (z)
float complex z;
long double complex casinhl (z)
long double complex z;

### Description

The casinh, casinfh, and casinlh subroutines compute the complex arc hyperbolic sine
of the z parameter, with branch cuts outside the interval
[-i, +i] along the imaginary axis.

### Parameters

z |
Specifies the value to be computed. |

### Return Values

The casinh, casinfh, and casinlh subroutines return the complex arc hyperbolic sine
value, in the range of a strip mathematically unbounded along the real axis
and in the interval [-i pi/2, +i pi/2] along the imaginary axis.

### Related Information

The casin, casinf, or casinl Subroutine.

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