Trigonometric Functions

This C# program demonstrates how to use the trigonometric math functions in C#.

Program.cs

using System;

namespace XoaX {
    class Program {
        static void Main(string[] args) {
            double dTheta = (2.0 * Math.PI) / 3.0;
            double dX = Math.Cos(dTheta);
            double dY = Math.Sin(dTheta);
            double dTan = Math.Tan(dTheta);
            Console.WriteLine("2*Pi/3 = " + dTheta);
            Console.WriteLine("The Cos of " + dTheta + " is " + dX);
            Console.WriteLine("The Sin of " + dTheta + " is " + dY);
            Console.WriteLine("The Tan of " + dTheta + " is " + dTan);
            // Theta is in the range of Acos(): [0, Math.PI]
            Console.WriteLine("The Acos of " + dX + " is " + Math.Acos(dX));
            // Theta is not in the range of Asin(): [-Math.PI/2, Math.PI/2]
            Console.WriteLine("The Asin of " + dY + " is " + Math.Asin(dY));
            // Theta is not in the range of Asin(): (-Math.PI/2, Math.PI/2)
            Console.WriteLine("The Atan of " + dTan + " is " + Math.Atan(dTan));
            // Theta is in the range of Atan2(): [0, 2*Math.PI]
            Console.WriteLine("The Atan2 of " + dX + " and " + dY + " is " + Math.Atan2(dY, dX));
        }
    }
}

Output

2*Pi/3 = 2.0943951023932
The Cos of 2.0943951023932 is -0.5
The Sin of 2.0943951023932 is 0.866025403784439
The Tan of 2.0943951023932 is -1.73205080756888
The Acos of -0.5 is 2.0943951023932
The Asin of 0.866025403784439 is 1.0471975511966
The Atan of -1.73205080756888 is -1.0471975511966
The Atan2 of -0.5 and 0.866025403784439 is 2.0943951023932
Press any key to continue . . .