13a8617a8SJordan K. Hubbard.\" Copyright (c) 1991 The Regents of the University of California. 23a8617a8SJordan K. Hubbard.\" All rights reserved. 33a8617a8SJordan K. Hubbard.\" 43a8617a8SJordan K. Hubbard.\" Redistribution and use in source and binary forms, with or without 53a8617a8SJordan K. Hubbard.\" modification, are permitted provided that the following conditions 63a8617a8SJordan K. Hubbard.\" are met: 73a8617a8SJordan K. Hubbard.\" 1. Redistributions of source code must retain the above copyright 83a8617a8SJordan K. Hubbard.\" notice, this list of conditions and the following disclaimer. 93a8617a8SJordan K. Hubbard.\" 2. Redistributions in binary form must reproduce the above copyright 103a8617a8SJordan K. Hubbard.\" notice, this list of conditions and the following disclaimer in the 113a8617a8SJordan K. Hubbard.\" documentation and/or other materials provided with the distribution. 12*fbbd9655SWarner Losh.\" 3. Neither the name of the University nor the names of its contributors 133a8617a8SJordan K. Hubbard.\" may be used to endorse or promote products derived from this software 143a8617a8SJordan K. Hubbard.\" without specific prior written permission. 153a8617a8SJordan K. Hubbard.\" 163a8617a8SJordan K. Hubbard.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 173a8617a8SJordan K. Hubbard.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 183a8617a8SJordan K. Hubbard.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 193a8617a8SJordan K. Hubbard.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 203a8617a8SJordan K. Hubbard.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 213a8617a8SJordan K. Hubbard.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 223a8617a8SJordan K. Hubbard.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 233a8617a8SJordan K. Hubbard.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 243a8617a8SJordan K. Hubbard.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 253a8617a8SJordan K. Hubbard.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 263a8617a8SJordan K. Hubbard.\" SUCH DAMAGE. 273a8617a8SJordan K. Hubbard.\" 2817303c62SDavid Schultz.Dd July 31, 2008 293a8617a8SJordan K. Hubbard.Dt ATAN 3 303a8617a8SJordan K. Hubbard.Os 313a8617a8SJordan K. Hubbard.Sh NAME 327a15a32aSJordan K. Hubbard.Nm atan , 3317303c62SDavid Schultz.Nm atanf , 3417303c62SDavid Schultz.Nm atanl 357a15a32aSJordan K. Hubbard.Nd arc tangent functions of one variable 3664890443SBruce Evans.Sh LIBRARY 3764890443SBruce Evans.Lb libm 383a8617a8SJordan K. Hubbard.Sh SYNOPSIS 3932eef9aeSRuslan Ermilov.In math.h 403a8617a8SJordan K. Hubbard.Ft double 413a8617a8SJordan K. Hubbard.Fn atan "double x" 427a15a32aSJordan K. Hubbard.Ft float 437a15a32aSJordan K. Hubbard.Fn atanf "float x" 4417303c62SDavid Schultz.Ft long double 4517303c62SDavid Schultz.Fn atanl "long double x" 463a8617a8SJordan K. Hubbard.Sh DESCRIPTION 473a8617a8SJordan K. HubbardThe 4817303c62SDavid Schultz.Fn atan , 4917303c62SDavid Schultz.Fn atanf , 5017303c62SDavid Schultzand 5117303c62SDavid Schultz.Fn atanl 527a15a32aSJordan K. Hubbardfunctions compute the principal value of the arc tangent of 533a8617a8SJordan K. Hubbard.Fa x . 543a8617a8SJordan K. Hubbard.Sh RETURN VALUES 5517303c62SDavid SchultzThese functions return the arc tangent in the range 563a8617a8SJordan K. Hubbard.Bk -words 573a8617a8SJordan K. Hubbard.Bq -\*(Pi/2 , +\*(Pi/2 583a8617a8SJordan K. Hubbard.Ek 593a8617a8SJordan K. Hubbardradians. 603a8617a8SJordan K. Hubbard.Sh SEE ALSO 613a8617a8SJordan K. Hubbard.Xr acos 3 , 623a8617a8SJordan K. Hubbard.Xr asin 3 , 633a8617a8SJordan K. Hubbard.Xr atan2 3 , 643a8617a8SJordan K. Hubbard.Xr cos 3 , 653a8617a8SJordan K. Hubbard.Xr cosh 3 , 6675141cc9SWolfram Schneider.Xr math 3 , 673a8617a8SJordan K. Hubbard.Xr sin 3 , 683a8617a8SJordan K. Hubbard.Xr sinh 3 , 693a8617a8SJordan K. Hubbard.Xr tan 3 , 7075141cc9SWolfram Schneider.Xr tanh 3 713a8617a8SJordan K. Hubbard.Sh STANDARDS 723a8617a8SJordan K. HubbardThe 7317303c62SDavid Schultz.Fn atan , 7417303c62SDavid Schultz.Fn atanf , 7517303c62SDavid Schultzand 7617303c62SDavid Schultz.Fn atanl 7717303c62SDavid Schultzfunctions conform to 7817303c62SDavid Schultz.St -isoC-99 . 79