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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 1.6.2.2 2001/03/06 16:46:24 ru Exp %
-.\"
-.\" $FreeBSD$
-.Dd May 2, 1991
-.Dt ACOS 3
-.Os
-.Sh 名称
-.Nm acos ,
-.Nm acosf
-.Nd 逆余弦関数
-.Sh 書式
-.Fd #include <math.h>
-.Ft double
-.Fn acos "double x"
-.Ft float
-.Fn acosf "float x"
-.Sh 解説
-.Fn acos
-および
-.Fn acosf
-関数は、
-.Fa x
-の逆余弦の主値を計算します。
-[-1, +1] の区間外の引数によって、領域エラーが発生します。
-丸めによる誤差の議論は、
-.Xr math 3
-を参照してください。
-.Sh 戻り値
-.Fn acos
-および
-.Fn acosf
-関数は、
-.Bq 0 , \*(Pi
-ラジアンの区間の逆余弦を返します。
-.Tn VAX
-および
-.Tn Tahoe
-では、
-.Bd -unfilled -offset indent
-.Pf \&| Ns Ar x Ns \&| > 1
-.Ed
-.Pp
-の場合に、
-.Fn acos x
-はグローバル変数
-.Va errno
-を
-.Er EDOM
-に設定し、予約されたオペランドフォルトが生成されます。
-.Sh 関連項目
-.Xr asin 3 ,
-.Xr atan 3 ,
-.Xr atan2 3 ,
-.Xr cos 3 ,
-.Xr cosh 3 ,
-.Xr math 3 ,
-.Xr sin 3 ,
-.Xr sinh 3 ,
-.Xr tan 3 ,
-.Xr tanh 3
-.Sh 規格
-.Fn acos
-関数は、
-.St -isoC
-に適合しています。
-
-