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ACOS
Section: Linux Programmer's Manual (3)
Updated: 2004-10-06
Index
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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);
Link with -lm.
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
SVr4, POSIX.1-2001, 4.3BSD, C89, C99.
The
float
and
long double
variants are C99 requirements.
SEE ALSO
asin(3),
atan(3),
atan2(3),
cacos(3),
cos(3),
sin(3),
tan(3)
COLOPHON
This page is part of release 3.05 of the Linux
man-pages
project.
A description of the project,
and information about reporting bugs,
can be found at
http://www.kernel.org/doc/man-pages/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- CONFORMING TO
-
- SEE ALSO
-
- COLOPHON
-
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