#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;
}