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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 2002-07-27 by Walter Harms
-.\" 	(walter.harms@informatik.uni-oldenburg.de)
-.\"
-.TH atan 3 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-atan, atanf, atanl \- arc tangent function
-.SH LIBRARY
-Math library
-.RI ( libm ", " \-lm )
-.SH SYNOPSIS
-.nf
-.B #include <math.h>
-.P
-.BI "double atan(double " x );
-.BI "float atanf(float " x );
-.BI "long double atanl(long double " x );
-.P
-.fi
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.BR atanf (),
-.BR atanl ():
-.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 principal value of the arc tangent of
-.IR x ;
-that is the value whose tangent is
-.IR x .
-.SH RETURN VALUE
-On success, these functions return the principal value of the arc tangent of
-.I x
-in radians; the return value is in the range [\-pi/2,\ pi/2].
-.P
-If
-.I x
-is a NaN, a NaN is returned.
-.P
-If
-.I x
-is +0 (\-0),
-+0 (\-0) is returned.
-.P
-If
-.I x
-is positive infinity (negative infinity), +pi/2 (\-pi/2) is returned.
-.\"
-.\" POSIX.1-2001 documents an optional range error for subnormal x;
-.\" glibc 2.8 does not do this.
-.SH ERRORS
-No errors occur.
-.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 atan (),
-.BR atanf (),
-.BR atanl ()
-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
-SVr4, 4.3BSD, C89.
-.SH SEE ALSO
-.BR acos (3),
-.BR asin (3),
-.BR atan2 (3),
-.BR carg (3),
-.BR catan (3),
-.BR cos (3),
-.BR sin (3),
-.BR tan (3)