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double acos(double d)

public class tutorialproTest {
    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 arc cosine of %.4f is %.4f degrees %n", Math.cos(radians), Math.toDegrees(Math.acos(Math.sin(radians))));

    }
}

The value of pi is 3.1416
The arc cosine of 0.7071 is 45.0000 degrees

public class tutorialproTest {
    public static void main(String[] args) {
        // Variables
        double a = 0.5;
        double b = 0.79;
        double c = 0.0;
        double d = 2;

        // Output
        System.out.println(Math.acos(a));  // 1.0471975511965979
        System.out.println(Math.acos(b));  // 0.6599873293874984
        System.out.println(Math.acos(c));  // 1.5707963267948966
        System.out.println(Math.acos(d));  // d is greater than 1, so it outputs NaN
    }
}

1.0471975511965979
0.6599873293874984
1.5707963267948966
NaN