.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
.\"
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.\" Since the Linux kernel and libraries are constantly changing, this
.\" manual page may be incorrect or out-of-date.  The author(s) assume no
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" References consulted:
.\"     Linux libc source code
.\"     Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
.\"     386BSD man pages
.\" Modified Sat Jul 24 21:44:59 1993 by Rik Faith (faith@cs.unc.edu)
.\"
.\" Traducido al castellano (con permiso) por:
.\" Sebastian Desimone (chipy@argenet.com.ar) (desimone@fasta.edu.ar)
.\" Modified 5 Jul 1996 Miguel A. Sepulveda (angel@vivaldi.princeton.edu)
.\" Translation revised June 16 1998 by Juan Piernas <piernas@dif.um.es>
.\"
.TH ACOS 3  "8 Junio 1993" "GNU" "Manual del Programador de Linux"
.SH NOMBRE
acos \- función arco coseno
.SH SINOPSIS
.nf
.B #include <math.h>
.sp
.BI "double acos(double " x );
.fi
.SH DESCRIPCIÓN
La función \fBacos()\fP calcula el arco coseno de \fIx\fP; éste es el valor
cuyo coseno es \fIx\fP. Si \fIx\fP está fuera del rango \-1 a 1, 
\fBacos()\fP falla y a \fIerrno\fP se le asigna un valor apropiado.
.SH "VALOR DEVUELTO"
La función \fBacos()\fP devuelve el arco coseno en radianes y el valor se
define matemáticamente para estar entre 0 y PI (inclusive).
.SH "ERRORES"
.TP
.B EDOM
\fIx\fP está fuera de rango.
.SH "CONFORME A"
SVID 3, POSIX, BSD 4.3, ISO 9899
.SH "VÉASE TAMBIÉN"
.BR asin "(3), " atan "(3), " atan2 "(3), " cos "(3), " sin "(3), " tan (3)