Related Articles

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

• Last Updated : 10 Oct, 2018

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

Syntax:

```cos (z);
```

Parameter:

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

Return value: This function returns the cos() of complex number z.

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

Program 1:-

 `// C++ program to demonstrate``// example of cos() function.``#include ``#include ``using` `namespace` `std;``  ` `// driver program``int` `main ()``{``  ``complex<``double``> complexnumber (0.0, 1.0);``  ` `  ` `  ``// use of cos() function for complex number``  ``cout << ``"The cos of "` `<< complexnumber << ``" is "``                     ``<< ``cos``(complexnumber) <
Output:
```The cos of (0,1) is (1.54308,-0)
```

Program 2:-

 `// C++ program to demonstrate``// example of cos() function.``#include ``#include ``using` `namespace` `std;``  ` `// driver program``int` `main ()``{``  ``complex<``double``> complexnumber (1.0, 0.0);``  ` `  ` `  ``// use of cos() function for complex number``  ``cout << ``"The cos of "` `<< complexnumber << ``" is "``                     ``<< ``cos``(complexnumber) <
Output:
```The cos of (1,0) is (0.540302,-0)
```
Want to learn from the best curated videos and practice problems, check out the C++ Foundation Course for Basic to Advanced C++ and C++ STL Course for foundation plus STL.  To complete your preparation from learning a language to DS Algo and many more,  please refer Complete Interview Preparation Course.

My Personal Notes arrow_drop_up