#include<stdio.h>
#include<math.h>
int main(){
	double a=0,dx=0.1,b=6;
	for(;a<b;a+=dx)printf("%f %f\n",a,sin(a));

	a=0; for(;a<b;a+=dx)fprintf(stderr,"%f %f %f\n",a,sin(a),cos(a));
	fprintf(stderr,"\n\n");
	a=0; for(;a<b;a+=dx)fprintf(stderr,"%f %f\n",a,-atan(a));
return 0;
}