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cosh() function in C++ STL
• Last Updated : 25 Jun, 2018

The cosh() is an inbuilt function in C++ STL which returns the hyperbolic cosine of an angle given in radians.

Syntax :

```cosh(data_type x)
```

Parameter :The function accepts one mandatory parameter x which specifies the hyperbolic angle in radian. The parameter can be of double, float or long double datatype.

Return Value: The function returns the hyperbolic cosine of the argument. If the magnitude of the result is too large to be represented by a value of the return type, the function returns inf.

Below programs illustrate the above method:

Program 1:

 `// CPP program to demonstrate the ` `// cosh() function ` `#include ` `using` `namespace` `std; ` ` `  `int` `main() ` `{ ` `    ``double` `x = 4.1, result; ` ` `  `    ``result = ``cosh``(x); ` `    ``cout << ``"cosh(4.1) = "` `<< result << endl; ` ` `  `    ``// x in Degrees ` `    ``double` `xDegrees = 90; ` `    ``x = xDegrees * 3.14159 / 180; ` ` `  `    ``result = ``cosh``(x); ` `    ``cout << ``"cosh(90 degrees) = "` `<< result << endl; ` ` `  `    ``return` `0; ` `} `

Output:

```cosh(4.1) = 30.1784
cosh(90 degrees) = 2.50918
```

Program 2:

 `// CPP program to demonstrate the ` `// cosh() function ` `#include ` `using` `namespace` `std; ` ` `  `int` `main() ` `{ ` `    ``int` `x = -4; ` `    ``double` `result; ` ` `  `    ``result = ``cosh``(x); ` `    ``cout << ``"cosh(-4) = "` `<< result << endl; ` ` `  `    ``// x in Degrees ` `    ``double` `xDegrees = 90; ` `    ``x = xDegrees * 3.14159 / 180; ` ` `  `    ``result = ``cosh``(x); ` `    ``cout << ``"cosh(90 degrees) = "` `<< result << endl; ` ` `  `    ``return` `0; ` `} `

Output:

```cosh(-4) = 27.3082
cosh(90 degrees) = 1.54308
```

Errors and Exceptions: The function returns no matching function for call to error when a string or character is passed as an argument.

Program 3:

 `// CPP program to demonstrate the  ` `// cosh() function when string passed ` `#include ` `using` `namespace` `std; ` ` `  `int` `main() ` `{ ` `    ``string x = ``"gfg"``; ` `    ``double` `result; ` ` `  `    ``result = ``cosh``(x); ` `    ``cout << ``"cosh("``gfg``") = "` `<< result << endl; ` ` `  `    ``return` `0; ` `} `

Output:

```prog.cpp:14:20: error: no matching function for call to 'cosh(std::__cxx11::string&)'
result = cosh(x);
```

Program 4: When argument is too large.

 `// CPP program to demonstrate the cosh() ` `// function ` `#include ` `using` `namespace` `std; ` ` `  `int` `main() ` `{ ` `    ``double` `x = 3000.0, result; ` ` `  `    ``result = ``cosh``(x); ` `    ``cout << ``"cosh(3000.0) = "` `<< result << endl; ` ` `  `    ``return` `0; ` `} `

Output:

```cosh(3000.0) = inf
```

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