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-.\" Copyright (c) 1991 The Regents of the University of California.
-.\" All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\" 3. All advertising materials mentioning features or use of this software
-.\"    must display the following acknowledgement:
-.\"	This product includes software developed by the University of
-.\"	California, Berkeley and its contributors.
-.\" 4. Neither the name of the University nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\"     from: @(#)acos.3	5.1 (Berkeley) 5/2/91
-.\" $FreeBSD: src/lib/msun/man/acos.3,v 1.13 2005/01/14 23:28:28 das Exp $
-.\"
-.Dd January 14, 2005
-.Dt ACOS 3
-.Os
-.Sh NAME
-.Nm acos ,
-.Nm acosf
-.Nd arc cosine functions
-.Sh LIBRARY
-.Lb libm
-.Sh SYNOPSIS
-.In math.h
-.Ft double
-.Fn acos "double x"
-.Ft float
-.Fn acosf "float x"
-.Sh DESCRIPTION
-The
-.Fn acos
-and the
-.Fn acosf
-functions compute the principal value of the arc cosine of
-.Fa x .
-A domain error occurs for arguments not in the range
-.Bq -1 , +1 .
-For a discussion of error due to roundoff, see
-.Xr math 3 .
-.Sh RETURN VALUES
-The
-.Fn acos
-and the
-.Fn acosf
-functions return the arc cosine in the range
-.Bq 0 , \*(Pi
-radians.
-If:
-.Bd -unfilled -offset indent
-.Pf \&| Ns Ar x Ns \&| > 1 ,
-.Ed
-.Pp
-.Fn acos x
-raises an invalid exception and returns an \*(Na.
-.Sh SEE ALSO
-.Xr asin 3 ,
-.Xr atan 3 ,
-.Xr atan2 3 ,
-.Xr cos 3 ,
-.Xr cosh 3 ,
-.Xr fenv 3 ,
-.Xr math 3 ,
-.Xr sin 3 ,
-.Xr sinh 3 ,
-.Xr tan 3 ,
-.Xr tanh 3
-.Sh STANDARDS
-The
-.Fn acos
-function conforms to
-.St -isoC .