The angle, a, must be in radians. Multiply by Math.PI/180 to convert degrees to radians.

Acceptable values of a range from approximately -9223372036854775295 to approximately 9223372036854775295. For values outside of this range, the Math.Sin(double) method returns a unchanged rather than throwing an exception.

The following example demonstrates using the Math.Sin(double) method.

using System;

public class MathSinExample
{

   public static void Main()
   {

      Double d1 = Math.Sin(0);
      Double d2 = Math.Sin(Math.PI/2.0);
      Console.WriteLine("Math.Sin(0) returns {0}", d1);
      Console.WriteLine("Math.Sin(Math.PI/2.0) returns {0}", d2);

   }

}

The output is