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Manual Pages  — ACOS

NAME

acos, acosf, acosl – arc cosine functions

CONTENTS

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.

RETURN VALUES

These functions return the arc cosine in the range [0, π] radians. If:
 |x| > 1,

acos(x) raises an invalid exception and returns an NaN.

SEE ALSO

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

STANDARDS

The acos(), acosf(), and acosl() functions conform to ISO/IEC 9899:1999 ("ISO C99").

ACOS (3) July 31, 2008

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