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ACOS
Section: Linux Programmer's Manual (3 )Updated: 1993-06-08
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NAME
acos - arc cosine functionSYNOPSIS
#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 9899SEE ALSO
asin(3), atan(3), atan2(3), cos(3), sin(3), tan(3)
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