#include<stdio.h>
double fun1(double x);
double fun2(double x);
int main(){
	for(double x=-2.5; x<= 2.5; x+=0.1){
		fprintf(stdout,"%g %g\n",x,fun1(x));
		fprintf(stderr,"%g %g\n",x,fun2(x));
	}
return 0;
}