#include <iostream>
#include <cmath>
using namespace std;

int main(){
 double alpha,z1,z2;
 bool have_result;

 cout<<"Enter value of angle: ";
 cin>>alpha;

 alpha = 3.14/180*alpha;

 if(cos(4*alpha)==-1 || cos(2*alpha) ==-1 || cos(3/2*3.14+alpha)==0){
  have_result = false;
 } else {
  have_result = true;
  z1 = sin(4*alpha)/(1+cos(4*alpha))*cos(2*alpha)/(1+cos(2*alpha));
  z2 = tan(3/2*3.14+alpha);
 }

 if(have_result){
  cout<<"z1 = "<<z1<<endl;
  cout<<"z2 = "<<z2<<endl;
 } else {
  cout<<"Answer can't be calculated"<<endl;
 }

 return 0;
}