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Math Cos()

using System;    class Example {       public static void Main() {         Double theta; // angle in radians            for(theta = 0.1; theta <= 1.0; theta = theta + 0.1) {        Console.WriteLine("Cosine of " + theta + "  is " +                          Math.Cos(theta));        Console.WriteLine();      }      }     } Cosine of 0.1 is 0.995004165278026 Cosine of 0.2 is 0.980066577841242 Cosine of 0.3 is 0.955336489125606 Cosine of 0.4 is 0.921060994002885 Cosine of 0.5 is 0.877582561890373 Cosine of 0.6 is 0.825335614909678 Cosine of 0.7 is 0.764842187284489 Cosine of 0.8 is 0.696706709347166 Cosine of 0.9 is 0.621609968270665 Cosine of 1 is 0.54030230586814