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

• Last Updated : 29 Aug, 2021

The tan() function for complex number is defined in the complex header file.This function is the complex version of the tan() function. This function is used to calculate the complex tan of complex number z. This function returns the tan of complex number z.

Syntax:

`tan(z);`

Parameter:

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

Return value: This function returns the tan() of complex number z.
Below programs illustrate the tan() function in C++:
PROGRAM 1:-

## CPP

 `// C++ program to demonstrate``// example of tan() function.``#include ``#include ``using` `namespace` `std;`` `  `int` `main ()``{``  ``complex<``double``> complexnumber (0.0, 1.0);`` ` ` ` `  ``// use of tan() function for complex number``  ``cout << ``"The tan of "` `<< complexnumber << ``" is "``                     ``<< ``tan``(complexnumber) <
Output:
`The tan of (0,1) is (0,0.761594)`

PROGRAM 2:-

## CPP

 `// C++ program to demonstrate``// example of tan() function.``#include ``#include ``using` `namespace` `std;` `int` `main ()``{``  ``complex<``double``> complexnumber (1.0, 0.0);`` ` ` ` `  ``// use of tan() function for complex number``  ``cout << ``"The tan of "` `<< complexnumber << ``" is "``                     ``<< ``tan``(complexnumber) << endl;`` ` ` ` `  ``return` `0;``}`
Output:
`The tan of (1,0) is (1.55741,0)`

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