#include<bits/stdc++.h>
using namespace std;
int main()
{
  double x1=(double)M_PI/6.0;
  double wyn1=0.0;
  double wyn2=0.0;
  double wyn3=0.0;
  double wyn4=0.0;
  for(int i =0;i<=30;i++)
  {
    wyn1=(4.0*cos(x1)*cos(x1))-3.0;
    wyn2=(2.0*cos(2.0*x1))-1;
    wyn3=cos(3.0*x1)/cos(x1);
    wyn4=1.0-(4.0*sin(x1)*sin(x1));
    cout << "dla x="<<x1<<"\n" <<"f1(x)="<<wyn1<<"\n"<<"f2(x)="<<wyn2<<"\n""f3(x)="<<wyn3<<"\n"<<"f4(x)="<<wyn4<<"\n";
    x1=x1+M_PI;
  }
  return 0;
}