.\" Copyright (c) 1985 Regents of the University of California.
.\" All rights reserved.  The Berkeley software License Agreement
.\" specifies the terms and conditions for redistribution.
.\"
.\"	@(#)sinh.3m	6.5 (Berkeley) 5/12/86
.\"
.TH SINH 3  "May 12, 1986"
.UC 4
.SH NAME
sinh, cosh, tanh \- hyperbolic functions
.SH SYNOPSIS
.nf
.ft B
#include <math.h>

double sinh(double \fIx\fP)
double cosh(double \fIx\fP)
double tanh(double \fIx\fP)
.ft R
.fi
.SH DESCRIPTION
These functions compute the designated hyperbolic functions for real arguments.
.SH DIAGNOSTICS
sinh(x) = cosh(x) = |x| if x is +Inf, \-Inf, or NaN.
.br
tanh(NaN) = NaN.
.br
Only sinh(0) = 0 is exact for finite x.
.br
Only cosh(0) = 1 is exact for finite x.
.br
Only tanh(0) = 0 is exact for finite x.
.SH SEE ALSO
.BR math (3).
.SH AUTHOR
W. Kahan, Kwok\-Choi Ng