double sin(double d)

public class Test {

   public static void main(String args[]) {
      double degrees = 45.0;
      double radians = Math.toRadians(degrees);

      System.out.format("The value of pi is %.4f%n", Math.PI);
      System.out.format("The sine of %.1f degrees is %.4f%n", degrees, Math.sin(radians));
   }
}

The value of pi is 3.1416
The sine of 45.0 degrees is 0.7071