#include <iostream>
#include <cmath>

using namespace std;

int main() {

float a = 0.0;

cout << "Введите a: ";
cin >> a;

cout << "z1 = " << (1 - 2 * pow(sin(a), 2)) / (1 + sin(2 * a)) << endl;
cout << "z2 = " << (1 - tan(a)) / (1 + tan(a)) << endl;

return 0;
}