# asin

ASIN(3) Linux Programmer's Manual ASIN(3)
NAME
asin - arc sine function
SYNOPSIS
#include <math.h>
double asin(double x);
DESCRIPTION
The asin() function calculates the arc sine of x; that is the value
whose sine is x. If x falls outside the range -1 to 1, asin() fails
and errno is set.
RETURN VALUE
The asin() function returns the arc sine in radians and the value is
mathematically defined to be between -PI/2 and PI/2 (inclusive).
ERRORS
EDOM x is out of range.
CONFORMING TO
SVID 3, POSIX, BSD 4.3, ISO 9899
SEE ALSO
acos(3), atan(3), atan2(3), cos(3), sin(3), tan(3)
1993-06-08 ASIN(3)