#include <stdio.h>
#include <math.h>
/*
set logscale x
set logscale y
plot "deriv.dat" pt 5 ps 2,x*x lc 0
*/
double Eh(double h){
    return fabs((sqrt(1+h)-sqrt(1-h))/(2*h)-1.0/2);
}

int main(){
    double h=1;
    for(int i=0;i<20;i++){
        printf("%g %g\n",h,Eh(h));
        h/=2;
    }
    return 0;
}