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+.\"	$OpenBSD: ccosh.3,v 1.3 2025/06/07 10:33:06 schwarze Exp $
+.\"
+.\" Copyright (c) 2011 Martynas Venckus <martynas@openbsd.org>
+.\"
+.\" Permission to use, copy, modify, and distribute this software for any
+.\" purpose with or without fee is hereby granted, provided that the above
+.\" copyright notice and this permission notice appear in all copies.
+.\"
+.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+.\"
+.Dd $Mdocdate: June 7 2025 $
+.Dt CCOSH 3
+.Os
+.Sh NAME
+.Nm ccosh ,
+.Nm ccoshf ,
+.Nm ccoshl
+.Nd complex hyperbolic cosine
+.Sh SYNOPSIS
+.Lb libm
+.In complex.h
+.Ft double complex
+.Fn ccosh "double complex z"
+.Ft float complex
+.Fn ccoshf "float complex z"
+.Ft long double complex
+.Fn ccoshl "long double complex z"
+.Sh DESCRIPTION
+The
+.Fn ccosh ,
+.Fn ccoshf
+and
+.Fn ccoshl
+functions compute the complex hyperbolic cosine of
+.Fa z .
+.Pp
+If
+.Fa z
+= x + iy, then
+.Bd -literal -offset indent
+ccosh(z) = cosh(x) cos(y) + i sinh(x) sin(y).
+.Ed
+.Sh RETURN VALUES
+The
+.Fn ccosh ,
+.Fn ccoshf
+and
+.Fn ccoshl
+functions return the complex hyperbolic cosine of
+.Fa z .
+.Sh SEE ALSO
+.Xr csinh 3 ,
+.Xr ctanh 3
+.Sh STANDARDS
+The
+.Fn ccosh ,
+.Fn ccoshf
+and
+.Fn ccoshl
+functions conform to
+.St -isoC-99 .