Java Math acos() 方法

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 arccosine of %.4f is %.4f degrees %n", Math.cos(radians),

         Math.toDegrees(Math.acos(Math.cos(radians))));

   }

}