ACOS(3) Linux Programmer's Manual ACOS(3)
NAMEacos - arc cosine function
SYNOPSIS#include <math.h> double acos(double x);
DESCRIPTIONThe 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 VALUEThe acos() function returns the arc cosine in radians and the value is mathematically defined to be between 0 and PI (inclusive).
ERRORSEDOM x is out of range.
CONFORMING TOSVID 3, POSIX, BSD 4.3, ISO 9899
asin, atan, atan2, cos, sin, tan,
June 8, 1993 1
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