public class Kosinussatz
{
 public static void main(String[]args)
 {
 double c, a = 4.0, b = 3.0, phi=3.14/2;
 
 c = Math.sqrt(a*a + b*b +2*a*b*Math.cos(phi));
 System.out.println("Länge c:" + c);
 }
}