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-'\" t
-.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
-.\" and Copyright 2008, Linux Foundation, written by Michael Kerrisk
-.\"     <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.\" References consulted:
-.\"     Linux libc source code
-.\"     Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
-.\"     386BSD man pages
-.\" Modified 1993-07-24 by Rik Faith (faith@cs.unc.edu)
-.\" Modified 2002-07-25 by Walter Harms
-.\" 	(walter.harms@informatik.uni-oldenburg.de)
-.\"
-.TH acos 3 (date) "Linux man-pages (unreleased)"
-.SH NAME
-acos, acosf, acosl \- arc cosine function
-.SH LIBRARY
-Math library
-.RI ( libm ", " \-lm )
-.SH SYNOPSIS
-.nf
-.B #include <math.h>
-.P
-.BI "double acos(double " x );
-.BI "float acosf(float " x );
-.BI "long double acosl(long double " x );
-.fi
-.P
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.BR acosf (),
-.BR acosl ():
-.nf
-    _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
-        || /* Since glibc 2.19: */ _DEFAULT_SOURCE
-        || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
-.fi
-.SH DESCRIPTION
-These functions calculate the arc cosine of
-.IR x ;
-that is
-the value whose cosine is
-.IR x .
-.SH RETURN VALUE
-On success, these functions return the arc cosine of
-.I x
-in radians; the return value is in the range [0,\ pi].
-.P
-If
-.I x
-is a NaN, a NaN is returned.
-.P
-If
-.I x
-is +1,
-+0 is returned.
-.P
-If
-.I x
-is positive infinity or negative infinity,
-a domain error occurs,
-and a NaN is returned.
-.P
-If
-.I x
-is outside the range [\-1,\ 1],
-a domain error occurs,
-and a NaN is returned.
-.SH ERRORS
-See
-.BR math_error (7)
-for information on how to determine whether an error has occurred
-when calling these functions.
-.P
-The following errors can occur:
-.TP
-Domain error: \fIx\fP is outside the range [\-1,\ 1]
-.I errno
-is set to
-.BR EDOM .
-An invalid floating-point exception
-.RB ( FE_INVALID )
-is raised.
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface	Attribute	Value
-T{
-.na
-.nh
-.BR acos (),
-.BR acosf (),
-.BR acosl ()
-T}	Thread safety	MT-Safe
-.TE
-.SH STANDARDS
-C11, POSIX.1-2008.
-.SH HISTORY
-C99, POSIX.1-2001.
-.P
-The variant returning
-.I double
-also conforms to
-C89, SVr4, 4.3BSD.
-.SH SEE ALSO
-.BR asin (3),
-.BR atan (3),
-.BR atan2 (3),
-.BR cacos (3),
-.BR cos (3),
-.BR sin (3),
-.BR tan (3)