ACOS(3) OpenBSD Programmer's Manual ACOS(3)NAME
acos, acosf, acosl - arc cosine functions
SYNOPSIS
#include <math.h>
double
acos(double x);
float
acosf(float x);
long double
acosl(long double x);
DESCRIPTION
The acos() function computes the principal value of the arc cosine of x
in the range [0, pi]. The acosf() is a single precision version of
acos(). The acosl() is an extended precision version of acos().
RETURN VALUES
If |x|>1, acos(x), acosf(x) and acosl(x) set the global variable errno to
EDOM.
SEE ALSOasin(3), atan(3), atan2(3), cos(3), cosh(3), math(3), sin(3), sinh(3),
tan(3), tanh(3)OpenBSD 4.9 December 12, 2008 OpenBSD 4.9