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acos, acosf, acosl - arc cosine function
#include <math.h>
double acos(double x);float acosf(float x);long double acosl(long 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. The float and long double variants are C99 requirements.
asin(3)
, atan(3)
, atan2(3)
, cos(3)
, sin(3)
, tan(3)
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