# MathF.Cos() Method in C# with Examples

MathF.Cos(Single) is an inbuilt MathF class method which returns the cosine of a given float value argument(specified angle).

Syntax: public static float Cos (float x);
Here, x is the angle(measured in radian) whose cosine is to be returned and the type of this parameter is System.Single.

Return Value: This method will return the cosine of x of type System.Single. If x is equal to NegativeInfinity, PositiveInfinity, or NaN, then this method returns NaN.

Below are the programs to illustrate the use of the above-discussed method:

Example 1:

 `// C# program to illustrate the ` `// MathF.Cos(Single) Method ` `using` `System; ` ` `  `class` `GFG{ ` ` `  `    ``// Main Method ` `    ``public` `static` `void` `Main(String[] args) ` `    ``{ ` `        ``float` `a = 45f; ` ` `  `        ``// converting value to radians ` `        ``float` `b = (a * (MathF.PI)) / 180; ` ` `  `        ``// using method and displaying result ` `        ``Console.WriteLine(MathF.Cos(b)); ` ` `  `        ``a = 54f; ` ` `  `        ``// converting value to radians ` `        ``b = (a * (MathF.PI)) / 180; ` ` `  `        ``// using method and displaying result ` `        ``Console.WriteLine(MathF.Cos(b)); ` `        ``a = 70f; ` ` `  `        ``// converting value to radians ` `        ``b = (a * (MathF.PI)) / 180; ` ` `  `        ``// using method and displaying result ` `        ``Console.WriteLine(MathF.Cos(b)); ` `    ``} ` `} `

Output:

```0.7071068
0.5877852
0.34202
```

Example 2: To show the working of MathF.Cos() method when the argument is NaN or Infinity.

 `// C# program to illustrate the ` `// MathF.Cos(Single) method  ` `using` `System; ` ` `  `class` `GFG { ` ` `  `    ``// Main Method ` `    ``public` `static` `void` `Main(String[] args) ` `    ``{ ` ` `  `         ``// taking infinity values ` `        ``float` `positiveInfinity = ``float``.PositiveInfinity; ` `        ``float` `negativeInfinity = ``float``.NegativeInfinity; ` ` `  `        ``// taking NaN  ` `        ``float` `nan = ``float``.NaN; ` ` `  `        ``float` `result; ` ` `  `        ``// Here argument is negative infinity, ` `        ``// so the output will be NaN ` `        ``result = MathF.Cos(negativeInfinity); ` `        ``Console.WriteLine(result); ` ` `  `        ``// Here argument is positive infinity, ` `        ``// so the output will also be NaN ` `        ``result = MathF.Cos(positiveInfinity); ` `        ``Console.WriteLine(result); ` ` `  `        ``// Here argument is NaN, output will be NaN ` `        ``result = MathF.Cos(nan); ` `        ``Console.WriteLine(result); ` `    ``} ` `} `

Output:

```NaN
NaN
NaN
```

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