---
name: "coshf"
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/cosh"
---

# coshf(3)

hyperbolic cosine functions

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

## NAME

**cosh**, **coshf**, **coshl** – hyperbolic cosine functions

## LIBRARY

Math Library (libm, -lm)

## SYNOPSIS

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

*double*\

**cosh**(*double x*);

*float*\

**coshf**(*float x*);

*long* *double*\

**coshl**(*long double x*);

## DESCRIPTION

The **cosh**(), **coshf**(), and **coshl**() functions compute the hyperbolic cosine of *x*.

## SEE ALSO

[acos(3)](/acos/3.md), [asin(3)](/asin/3.md), [atan(3)](/atan/3.md), [atan2(3)](/atan2/3.md), [ccosh(3)](/ccosh/3.md), [cos(3)](/cos/3.md), [math(3)](/math/3.md), [sin(3)](/sin/3.md), [sinh(3)](/sinh/3.md), [tan(3)](/tan/3.md), [tanh(3)](/tanh/3.md)

## STANDARDS

The **cosh**() function conforms to ISO/IEC 9899:1990 (“ISO C90”).

## HISTORY

The **cosh**() function first appeared in Version 7 AT&T UNIX.