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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 <iostream>
#include <complex>
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) <<endl;
   
   
  return 0;
}
Output:
The cos of (0,1) is (1.54308,-0)

Program 2:-




// C++ program to demonstrate
// example of cos() function.
#include <iostream>
#include <complex>
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) <<endl;
   
   
  return 0;
}
Output:
The cos of (1,0) is (0.540302,-0)
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