ASIN

asin ? arc sine function

#include <math.h>

double asin(double x);

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.

The asin() function returns the arc sine in radians and the value is mathematically defined to be between -PI/2 and PI/2 (inclusive).

EDOM

x is out of range.

SVID 3, POSIX, BSD 4.3, ISO 9899

acos(3), atan(3), atan2(3), cos(3), sin(3), tan(3)