Math : cos

public class CosMethod {


    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 cosine of %.1f degrees is %.4f%n", degrees, Math.cos(radians));    }

}