ACOS
Section: Linux Programmer's Manual (3)
Updated: June 8, 1993
NAME
acos - arc cosine function
SYNOPSIS
#include <math.h>
double acos(double x);
DESCRIPTION
The acos() function calculates the arc cosine of x; that is
the value whose cosine is x. If x falls outside the range
-1 to 1, acos() fails and errno is set.
RETURN VALUE
The acos() function returns the arc cosine in radians and the
value is mathematically defined to be between 0 and PI (inclusive).
ERRORS
- EDOM
-
x is out of range.
CONFORMING TO
SVID 3, POSIX, BSD 4.3, ISO 9899
SEE ALSO
asin(3), atan(3), atan2(3), cos(3), sin(3), tan(3)