acos3
Arc cosine functions
Usage
#include <math.h>
double
acos(double x);
float
acosf(float x);
long double
acosl(long double x);
Library
Math Library (libm, -lm)
Overview
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], radians. If:
|x| > 1,
acos(x) raises an invalid exception and returns an .
Releases
87 releases since FreeBSD 2.0.5-RELEASE; the text changed 47 times.