ACOS
Section: Linux Programmer's Manual (3)
Updated: June 8, 1993
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NAME
acos - arc cosine function
SYNOPSIS
#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 9899
SEE ALSO
asin(3), atan(3), atan2(3), cos(3), sin(3), tan(3)
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- CONFORMING TO
-
- SEE ALSO
-
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