# C# | Math.Sin() Method

Math.Sin() is an inbuilt Math class method which returns the sine of a given double value argument(specified angle).

Syntax:

`public static double Sin(double num)`

Parameter:

num: It is the angle(measured in radian) whose sine is to be returned and the type of this parameter is System.Double.

Return Value: Returns the sine of num of type System.Double. If num is equal to NegativeInfinity, PositiveInfinity, or NaN, then this method returns NaN.

Below are the programs to illustrate the Math.Sin() method.

Program 1: To show the working of Math.Sin() method.

 `// C# program to demonstrate working ` `// Math.Sin() method ` `using` `System; ` `  `  `class` `Geeks { ` `  `  `    ``// Main Method ` `    ``public` `static` `void` `Main(String []args) ` `    ``{ ` `        ``double` `a = 30; ` `          `  `        ``// converting value to radians ` `        ``double` `b = (a * (Math.PI)) / 180; ` `  `  `        ``// using method and displaying result ` `        ``Console.WriteLine(Math.Sin(b)); ` `        ``a = 45; ` `          `  `        ``// converting value to radians ` `        ``b = (a * (Math.PI)) / 180; ` `  `  `        ``// using method and displaying result ` `        ``Console.WriteLine(Math.Sin(b)); ` `        ``a = 60; ` `          `  `        ``// converting value to radians ` `        ``b = (a * (Math.PI)) / 180; ` ` `  `        ``// using method and displaying result ` `        ``Console.WriteLine(Math.Sin(b)); ` `        ``a = 90; ` `          `  `        ``// converting value to radians ` `        ``b = (a * (Math.PI)) / 180; ` `  `  `        ``// using method and displaying result ` `        ``Console.WriteLine(Math.Sin(b)); ` `    ``} ` `} `

Output:

```0.5
0.707106781186547
0.866025403784439
1
```

Program 2: To show the working of Math.Sin() method when the argument is NaN or infinity.

 `// C# program to demonstrate working ` `// Math.Sin() method in infinity case ` `using` `System; ` ` `  `class` `Geeks { ` `     `  `    ``// Main Method ` `    ``public` `static` `void` `Main(String []args) ` `    ``{ ` ` `  `        ``double` `positiveInfinity = Double.PositiveInfinity; ` `                `  `        ``double` `negativeInfinity = Double.NegativeInfinity; ` `                `  `                `  `        ``double` `nan = Double.NaN; ` `        ``double` `result; ` ` `  `        ``// Here argument is negative infinity, ` `        ``// output will be NaN ` `         ``result = Math.Sin(negativeInfinity); ` `         ``Console.WriteLine(result); ` ` `  `        ``// Here argument is positive infinity, ` `        ``// output will also be NaN ` `        ``result = Math.Sin(positiveInfinity); ` `        ``Console.WriteLine(result); ` ` `  `        ``// Here argument is NaN, output will be NaN ` `        ``result = Math.Sin(nan); ` `        ``Console.WriteLine(result); ` `    ``} ` `} `

Output:

```NaN
NaN
NaN
```

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