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

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