ASIN
Section: Linux Programmer's Manual (3)
Updated: 2008-08-05
Index
Return to Main Contents
NAME
asin, asinf, asinl - arc sine function
SYNOPSIS
#include <math.h>
double asin(double x);
float asinf(float x);
long double asinl(long double x);
Link with -lm.
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
asinf(),
asinl():
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE; or
cc -std=c99
DESCRIPTION
The
asin()
function calculates the principal value of the arc sine of x;
that is the value whose sine is x.
RETURN VALUE
On success, these functions return the principal value of the arc sine of
x
in radians; the return value is in the range [-pi/2, pi/2].
If
x
is a NaN, a NaN is returned.
If
x
is +0 (-0),
+0 (-0) is returned.
If
x
is outside the range [-1, 1],
a domain error occurs,
and a NaN is returned.
ERRORS
See
math_error(7)
for information on how to determine whether an error has occurred
when calling these functions.
The following errors can occur:
- Domain error: x is outside the range [-1, 1]
-
errno
is set to
EDOM.
An invalid floating-point exception
(FE_INVALID)
is raised.
CONFORMING TO
C99, POSIX.1-2001.
The variant returning
double
also conforms to
SVr4, 4.3BSD, C89.
SEE ALSO
acos(3),
atan(3),
atan2(3),
casin(3),
cos(3),
sin(3),
tan(3)
COLOPHON
This page is part of release 3.22 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/.