Math.Sin() Method in C#

The Math.Sin() method in C# is used to return the sine of a specified angle. The method accepts an angle in radians and returns a double value representing the sine of that angle.

Syntax

Following is the syntax for the Math.Sin() method −

public static double Sin(double val);

Parameters

• val − A double value representing an angle in radians.

Return Value

The method returns a double value representing the sine of the specified angle. The return value ranges from -1 to 1. For special cases −

• If the parameter is NaN or infinity, the method returns NaN.

• If the parameter is positive or negative zero, the method returns positive or negative zero respectively.

Using Math.Sin() with Degree to Radian Conversion

Since Math.Sin() expects radians, you must convert degrees to radians using the formula: radians = degrees × ? / 180.

Example

using System;

public class Demo {
   public static void Main() {
      double val1 = 30.0;
      double radians = (val1 * Math.PI) / 180;
      Console.WriteLine("Sin(" + val1 + "°) = " + Math.Sin(radians));
      
      double val2 = 90.0;
      radians = (val2 * Math.PI) / 180;
      Console.WriteLine("Sin(" + val2 + "°) = " + Math.Sin(radians));
   }
}

The output of the above code is −

Sin(30°) = 0.5
Sin(90°) = 1

Using Math.Sin() with Special Values

Example

using System;

public class Demo {
   public static void Main() {
      double val1 = 45.0;
      double val2 = Double.PositiveInfinity;
      double val3 = Double.NaN;
      double val4 = 0.0;
      
      Console.WriteLine("Sin(45°) = " + Math.Sin((val1 * Math.PI) / 180));
      Console.WriteLine("Sin(PositiveInfinity) = " + Math.Sin(val2));
      Console.WriteLine("Sin(NaN) = " + Math.Sin(val3));
      Console.WriteLine("Sin(0) = " + Math.Sin(val4));
   }
}

The output of the above code is −

Sin(45°) = 0.707106781186547
Sin(PositiveInfinity) = NaN
Sin(NaN) = NaN
Sin(0) = 0

Common Sine Values

Conclusion

The Math.Sin() method calculates the sine of an angle measured in radians. Remember to convert degrees to radians when working with degree measurements, and handle special cases like infinity and NaN appropriately in your applications.