Originální popis anglicky:
acos, acosf, acosl - arc cosine function
Návod, kniha: Linux Programmer's Manual
#include <math.h>
double acos(double x);
float acosf(float x);
long double acosl(long double x);
Link with -lm.
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)
