.asin()

The Math.asin() method returns the inverse sine (or arcsine) of the argument in radians.

Math.asin(n)

n is a double between 0 and 1.

The following example uses Math.asin() to return the inverse sine of 1.0:

public class Main {
  public static void main(String[] args) {

    double x = 1.0;

    System.out.println(Math.asin(x));
    // Output: 1.5707963267948966

  }
}