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

## NAME

**acos**, **acosf** - arc cosine function

## LIBRARY

libm

## SYNOPSIS

**#include <math.h>**
*double*
**acos**(*double x*);
*float*
**acosf**(*float x*);

## DESCRIPTION

The **acos**() and **acosf**() functions compute the principal value of the arc
cosine of *x* in the range [0, pi].

## RETURN VALUES

If |x|>1, **acos**(*x*) and **acosf**(*x*) set the global variable *errno* to EDOM.

## SEE ALSO

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

## STANDARDS

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

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