.\" Copyright (c) 1989, 1991 The Regents of the University of California.
.\" All rights reserved.
.\"
.\" %sccs.include.redist.man%
.\"
.\"     @(#)cosh.3	5.1 (Berkeley) 05/02/91
.\"
.Dd 
.Dt COSH 3
.Os
.Sh NAME
.Nm cosh
.Nd hyperbolic cosine function
.Sh SYNOPSIS
.Fd #include <math.h>
.Ft double
.Fn cosh "double x"
.Sh DESCRIPTION
The
.Fn cosh
function computes the hyperbolic cosine of
.Fa x .
.Sh RETURN VALUES
The
.Fn cosh
function returns the hyperbolic cosine unless the magnitude
of
.Fa x
is too large; in this event, the global variable
.Va errno
is set to
.Er ERANGE . 
.Sh SEE ALSO
.Xr acos 3 ,
.Xr asin 3 ,
.Xr atan 3 ,
.Xr atan2 3 ,
.Xr cos 3 ,
.Xr sin 3 ,
.Xr sinh 3 ,
.Xr tan 3 ,
.Xr tanh 3 ,
.Xr math 3 ,
.Sh STANDARDS
The
.Fn cosh
function conforms to
.St -ansiC .