cos() function for complex number in C++ Last Updated : 12 Oct, 2022 Comments Improve Suggest changes Like Article Like Report The cos() function for a 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 the 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: CPP // C++ program to demonstrate // example of cos() function #include <complex> #include <iostream> 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) Time Complexity: O(1)Auxiliary Space: O(1) Program 2: CPP // C++ program to demonstrate // example of cos() function. #include <complex> #include <iostream> 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) Time Complexity: O(1)Auxiliary Space: O(1) Comment More infoAdvertise with us Next Article cos() function for complex number in C++ bansal_rtk_ Follow Improve Article Tags : Misc C++ CPP-Library cpp-numerics-library Practice Tags : CPPMisc Similar Reads exp() function for complex number in C++ The exp() function for complex number is defined in the complex header file. 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