---
name: "csinh"
section: "3"
platform: "freebsd"
package: "base"
version: "16.0-CURRENT-20261027-61c70dc16a79"
release: "FreeBSD 16.0-CURRENT (2026-10-27)"
platforms: ["linux", "freebsd"]
url: "https://new.carta.tech/ccosh"
---

# csinh(3)

complex hyperbolic functions

Part of [ccosh(3)](/ccosh/3.md).

## NAME

**ccosh**, **ccoshf**, **csinh**, **csinhf**, **ctanh**, **ctanhf** – complex hyperbolic functions

## LIBRARY

Math Library (libm, -lm)

## SYNOPSIS

**#include \<complex.h\>**

*double* *complex*\

**ccosh**(*double complex z*);

*float* *complex*\

**ccoshf**(*float complex z*);

*double* *complex*\

**csinh**(*double complex z*);

*float* *complex*\

**csinhf**(*float complex z*);

*double* *complex*\

**ctanh**(*double complex z*);

*float* *complex*\

**ctanhf**(*float complex z*);

## DESCRIPTION

The **ccosh**(), **csinh**(), and **ctanh**() functions compute the hyperbolic cosine, sine, and tangent of the complex number *z*, respectively. The **ccoshf**(), **csinhf**(), and **ctanhf**() functions perform the same operations in *float* precision.

## SEE ALSO

[cacosh(3)](/cacosh/3.md), [ccos(3)](/ccos/3.md), [complex(3)](/complex/3.md), [cosh(3)](/cosh/3.md), [math(3)](/math/3.md), [sinh(3)](/sinh/3.md), [tanh(3)](/tanh/3.md)

## STANDARDS

These functions conform to ISO/IEC 9899:1999 (“ISO C99”).