Java tutorial
public class Main { public static void main(String[] args) { double d1 = 0.20, d2 = 60.00, d3 = 0; System.out.println("arc tangent of " + d1 + " = " + StrictMath.atan(d1)); System.out.println("arc tangent of " + d2 + " = " + StrictMath.atan(d2)); System.out.println("arc tangent of " + d3 + " = " + StrictMath.atan(d3)); } }