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acos(3) -- Linux man page
NAME
acos, acosf, acosl - arc cosine function
SYNOPSIS
#include <math.h>
double acos(double x);
float acosf(float x);
long double acosl(long 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 9899.
The float and long double variants are C99 requirements.
SEE ALSO
asin(3),
atan(3),
atan2(3),
cos(3),
sin(3),
tan(3)
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