relation.........demo....

import java.util.*;
interface operation
{
  double square(double a);
  double cube(double a);
  double sine(double a);
  double cosine(double a);


}
public class HelloWorld implements operation
{

    public double square(double a)
     {
        return Math.pow(a,2);

     }
      public double cube(double a)
     {
        return Math.pow(a,3);

     }
     public double sine(double a)
     {
       double z=Math.toRadians(a);
        return Math.sin(z);

     }
     public double cosine(double a)
     {
       double y=Math.toRadians(a);
        return Math.cos(y);

     }
public static void main(String args[])
{
    Double x;
   HelloWorld i=new HelloWorld(); 
  operation a=new HelloWorld();
  Scanner sc=new Scanner(System.in);
  //System.out.println("enter no");
 // x=sc.nextDouble();
 System.out.println("square is="+a.square(5));
 System.out.println("cube is="+a.cube(6));
System.out.println("sine is="+a.sine(45));
System.out.println("cosine is="+a.cosine(90));

    
}
}