জাভা atan2 গণিত

public class Main {
  public static void main(String[] args) {
    System.out.println(Math.atan2(0.5, 0.4));
    System.out.println(Math.atan2(0.5, 0.5));
    System.out.println(Math.atan2(0.5, 0.6));
  }
}