>>352
#include<stdio.h>
#include<math.h>

#define N 1000

double f(double x){
return sin(2*x)*cos(x);
}

int main(void){
double x, dx=(M_PI/4)/N;
int i;

for(i=0;i<=N;i++){
x=i*dx;
printf("%f %f\n", x, f(x));
}

return 0;
}