Copyright (c) 1991 The Regents of the University of California.
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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 n 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 q -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 q 0 , \*(Pi radians. If: d -unfilled -offset indent
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 n 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 q -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 q 0 , \*(Pi radians. If: d -unfilled -offset indent
f | Ns Ar x Ns | > 1 , .Ed
p .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 .
