ATAN(3) BSD Programmer's Manual ATAN(3)

## NAME

**atan**, **atanf** - arc tangent function of one variable

## LIBRARY

libm

## SYNOPSIS

**#include <math.h>**
*double*
**atan**(*double x*);
*float*
**atanf**(*float x*);

## DESCRIPTION

The **atan**() and **atanf**() functions compute the principal value of the arc
tangent of *x* in the range [-pi/2, +pi/2].

## SEE ALSO

acos(3), asin(3), atan2(3), cos(3), cosh(3), math(3), sin(3), sinh(3),
tan(3), tanh(3)

## STANDARDS

The **atan**() functions conforms to ANSI X3.159-1989 ("ANSI C").
MirOS BSD #10-current May 2, 1991 1

Generated on 2016-02-08 23:56:27 by
`$MirOS: src/scripts/roff2htm,v 1.82 2016/01/02 20:05:08 tg Exp $`

These manual pages and other documentation are copyrighted by their respective writers;
their source is available at our CVSweb,
AnonCVS, and other mirrors. The rest is Copyright © 2002–2016 The MirOS Project, Germany.

This product includes material
provided by *mirabilos*.

This manual page’s HTML representation
is supposed to be valid
XHTML/1.1; if not, please send a bug report – diffs preferred.