GOVNISHE EBANOE!!!!

#include <iostream>
#include <cmath>
double Z1(double A, double B)
{
    double sum1 = pow((cos(A) - cos(B)), 2);
    double sum2 = (sin(A) - sin(B));
    return sum1 - sum2;
}

double Z2(double A, double B)
{
    double fac1 = pow(sin((A - B) / 2), 2);
    double fac2 = cos(A + B);
    return (-4)*fac1*fac2;
}

int main()
{
    std::cout << "Enter A and B: ";
    double A, B;
    std::cin >> A >> B;
    std::cout << "Z1: " << Z1(A, B) << std::endl << "Z2: " << Z2(A, B) << std::endl;
    return 0;
}