/**
* Returns the arc sine of the specified value, in the range of -<i>pi</i>/2 through <i>pi</i>/2.
*
* @param x the value whose arc sine is to be returned.
* @return the arc sine in radians for the specified value.
*/
public static double asin(double x) {
if (x < -1.0 || x > 1.0) return MathLib.NaN;
if (x == -1.0) return -HALF_PI;
if (x == 1.0) return HALF_PI;
return MathLib.atan(x / MathLib.sqrt(1.0 - x * x));
}
