Get the arc cosine of an angle in Java

To get the arc cosine of a given value in Java, we use the java.lang.Math.acos() method. The acos() method accepts a double value whose angle needs to be computed. The range of the angle returned lies in the range 0 to pi. If the argument is NaN or greater than 1 or less than -1 then the result is NaN.

Declaration −The java.lang.Math.acos() method is declared as follows −

public static double acos(double a)

Here, a is the value whose arc cosine is computed.

Let us see a program to get the arc cosine of a given value in Java.

Example

 Live Demo

import java.lang.Math;
public class Example {
   public static void main(String[] args) {
   // get two double numbers in degrees
      double x = Math.sqrt(3)/2;
      double y = 0.5;
      // computing and displaying the arc cosine of these doubles
      System.out.println("Arc cosine of " + x + " = " + Math.acos(x));
      System.out.println("Arc cosine of " + y + " = " + Math.acos(y));
   }
}

Output

Arc cosine of 0.8660254037844386 = 0.5235987755982989
Arc cosine of 0.5 = 1.0471975511965979