#include <iostream>
#include <math.h>
using namespace std;
float z;
int x=1;

       
 int main(){        
         
  
if (fabs(x-1)==0) {cout<<"denominatore uguale a zero -espressione impossibile"<<endl;}
     else {
        z=sqrt(pow(x, 4)-3)/fabs(x-1);
          cout<<"z= "<<z<<endl;

       }







	
	return 0;
}