# C# | Math.Cosh() Method

Math.Cosh() is the inbuilt Math class method which returns the hyperbolic cosine of a given double value argument.

Syntax:

`public static double Cosh(double num)`

Parameters:

num: It is the number whose hyperbolic cos is to be returned and type of this parameter is System.Double.

Return Value: The method returns the hyperbolic cos of num of type System.Double. If num is equal to NegativeInfinity or PositiveInfinity, PositiveInfinity is returned. If num is equal to NaN, NaN is returned.

Example:

```Input   : 60.0
Output  : 5.71003694907842E+25
```

Below programs illustrate the Math.Cosh method:

Program 1:

 `// C# program to illustrate the ` `// Math.Cosh() ` `using` `System; ` ` `  `class` `GFG { ` `   `  `    ``// Main Method ` `    ``public` `static` `void` `Main(String[] args) ` `    ``{ ` ` `  `        ``double` `num1 = 60.0, num2 = 0.0, num3 = 1.0; ` ` `  `        ``// It returns the hyperbolic cosine of  ` `        ``// specified angle in radian ` `        ``double` `coshvalue = Math.Cosh(num1); ` `        ``Console.WriteLine(``"The cosh of num1 = "` `+ coshvalue); ` ` `  `        ``coshvalue = Math.Cosh(num2); ` `        ``Console.WriteLine(``"The cosh of num2 = "` `+ coshvalue); ` ` `  `        ``coshvalue = Math.Cosh(num3); ` `        ``Console.WriteLine(``"The cosh of num3 = "` `+ coshvalue); ` `    ``} ` `} `

Output:

```The cosh of num1 = 5.71003694907842E+25
The cosh of num2 = 1
The cosh of num3 = 1.54308063481524
```

Program 2:

 `// C# praogram to illustrate the ` `// Math.Cosh() Method ` `using` `System; ` ` `  `class` `GFG { ` `    `  `    ``// Main Method ` `    ``public` `static` `void` `Main(String[] args) ` `    ``{ ` ` `  `        ``double` `num1 = (30 * (Math.PI)) / 180, num2 = 11.0, num3 = 45.0; ` ` `  `        ``// It returns the hyperbolic cosine of  ` `        ``// angle in radian ` `        ``double` `coshvalue = Math.Cosh(num1); ` `        ``Console.WriteLine(``"The cosh of num1 = "` `+ coshvalue); ` ` `  `        ``coshvalue = Math.Cosh(num2); ` `        ``Console.WriteLine(``"The cosh of num2 = "` `+ coshvalue); ` ` `  `        ``coshvalue = Math.Cosh(num3); ` `        ``Console.WriteLine(``"The cosh of num3 = "` `+ coshvalue); ` `    ``} ` `} `

Output:

```The cosh of num1 = 1.14023832107643
The cosh of num2 = 29937.0708659498
The cosh of num3 = 1.74671355287425E+19
```

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