Manual browser: acos(3)

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ACOS(3) Library Functions Manual ACOS(3)

NAME

acos, acosf, acoslarc cosine function

LIBRARY

Math Library (libm, -lm)

SYNOPSIS

#include <math.h>

double
acos(double x);

float
acosf(float x);

long double
acosl(long double x);

DESCRIPTION

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

RETURN VALUES

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

STANDARDS

The acos() function conforms to ISO/IEC 9899:1999 (“ISO C99”).
January 29, 2013 NetBSD 7.0