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+.\"	$OpenBSD: atan2.3,v 1.21 2025/06/07 10:33:06 schwarze Exp $
+.\" Copyright (c) 1991 The Regents of the University of California.
+.\" 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. 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: @(#)atan2.3	5.1 (Berkeley) 5/2/91
+.\"
+.Dd $Mdocdate: June 7 2025 $
+.Dt ATAN2 3
+.Os
+.Sh NAME
+.Nm atan2 ,
+.Nm atan2f ,
+.Nm atan2l
+.Nd arc tangent functions of two variables
+.Sh SYNOPSIS
+.Lb libm
+.In math.h
+.Ft double
+.Fn atan2 "double y" "double x"
+.Ft float
+.Fn atan2f "float y" "float x"
+.Ft long double
+.Fn atan2l "long double y" "long double x"
+.Sh DESCRIPTION
+The
+.Fn atan2
+function computes the principal value of the arc tangent of
+.Fa y Ns / Ns Fa x ,
+using the signs of both arguments to determine the quadrant of
+the return value.
+The
+.Fn atan2f
+function is a single precision version of
+.Fn atan2 .
+The
+.Fn atan2l
+function is an extended precision version of
+.Fn atan2 .
+.Sh RETURN VALUES
+The
+.Fn atan2 ,
+.Fn atan2f
+and
+.Fn atan2l
+functions, if successful,
+return the arc tangent of
+.Fa y Ns / Ns Fa x
+in the range
+.Bk -words
+.Bq \&- Ns pi , \&+ Ns pi
+.Ek
+radians.
+If both
+.Fa x
+and
+.Fa y
+are zero, the global variable
+.Va errno
+is set to
+.Er EDOM .
+.Sh SEE ALSO
+.Xr acos 3 ,
+.Xr asin 3 ,
+.Xr atan 3 ,
+.Xr cos 3 ,
+.Xr cosh 3 ,
+.Xr sin 3 ,
+.Xr sinh 3 ,
+.Xr tan 3 ,
+.Xr tanh 3
+.Sh STANDARDS
+The
+.Fn atan2
+function conforms to
+.St -ansiC .