Table of Contentsacos - arc cosine function #include <math.h>
double acos(double x); 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. The acos() function returns the arc cosine in radians and the value is mathematically defined to be between 0 and PI (inclusive). - EDOM
- x is out of range.
SVID 3, POSIX, BSD 4.3, ISO 9899 asin(3), atan(3), atan2(3), cos(3), sin(3), tan(3)
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