.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
.\"
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.\" Since the Linux kernel and libraries are constantly changing, this
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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 21:44:26 1993 by Rik Faith (faith@cs.unc.edu)
.\" Переведен на русский Fri 22 Sep 2000 11:26:59, Alexey V. Medvedev 2:5022/78.6
.TH ACOSH 3  "June 13, 1993" "" "Linux Programmer's Manual"
.SH ИМЯ
acosh \- вычисление обратного гиперболического косинуса
.SH СИНТАКСИС
.nf
.B #include <math.h>
.sp
.BR "double acosh(double " x );
.fi
.SH ОПИСАНИЕ
Функция \fBacosh()\fP вычисляет обратный гиперболический косинус
аргумента\fIx\fP.
Это число, гиперболический косинус которого равен \fIx\fP.  Если \fIx\fP 
меньше 1.0, \fBacosh()\fP возвращает значение "не-число" (NaN) и
устанавливает \fIerrno\fP. 
.SH "КОДЫ ОШИБОК"
.TP
.B EDOM
.I x
лежит вне области определения.
.SH "СООТВЕТСТВИЕ СТАНДАРТАМ"
SVID 3, POSIX, BSD 4.3, ISO 9899
.SH "СМОТРИ ТАКЖЕ"
.BR asinh "(3), " atanh "(3), " cosh "(3), " sinh "(3), " tanh (3)