# 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

Updated on: 26-Jun-2020

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