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# asinh() function for complex number in C++

• Last Updated : 11 Oct, 2018

The asinh() function for complex number is defined in the complex header file. This function is the complex version of the asinh() function. This function is used to calculate the complex arc hyperbolic sine of complex number z and returns the arc hyperbolic sine of complex number z.

Syntax:

```template<class T> complex<T>
asinh (const complex<T>& z );
```

Parameter:This method takes a mandatory parameter z which represents the complex number.

Return value: This function returns the arc hyperbolic sine of complex number z.

Below programs illustrate the asinh() function in C++:

Example 1:

 `// c++ program to demonstrate``// example of asinh() function.`` ` `#include ``using` `namespace` `std;`` ` `// driver program``int` `main()``{``    ``complex<``double``> complexnumber(-2.0, 0.0);`` ` `    ``// use of asinh() function for complex number``    ``cout << ``"The asinh of "``         ``<< complexnumber``         ``<< ``" is "``         ``<< asinh(complexnumber)``         ``<< endl;`` ` `    ``return` `0;``}`
Output:
```The asinh of (-2,0) is (-1.44364,0)
```

Example 2:-

 `// c++ program to demonstrate``// example of asinh() function.`` ` `#include ``using` `namespace` `std;`` ` `// driver program``int` `main()``{``    ``complex<``double``> complexnumber(-0.0, -2.0);`` ` `    ``// use of asinh() function for complex number``    ``cout << ``"The asinh of "``         ``<< complexnumber``         ``<< ``" is "``         ``<< asinh(complexnumber)``         ``<< endl;`` ` `    ``return` `0;``}`
Output:
```The asinh of (-0,-2) is (-1.31696,-1.5708)
```
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