ASIN Section: Linux Programmer's Manual (3) Updated: June 8, 2025 Index   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   Index NAME SYNOPSIS DESCRIPTION RETURN VALUE ERRORS CONFORMING TO SEE ALSO This document was created by using the manual pages. Time: 11:58:02 GMT, March 24, 2025