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

#define NUM_STEPS 300
#define TIME_STEP 0.01

int main() {
    double t = 0.0;
    double x = 0.0, y = 0.0;

    printf("%12s %12s\n", "x", "y");

    for (int i = 0; i < NUM_STEPS; i++) {
        t += TIME_STEP;
        double dxdt = x + exp(-t/2) * cos(5*t);
        double dydt = 0.5*y + exp(-t/2) * sin(5*t);
        x += dxdt * TIME_STEP;
        y += dydt * TIME_STEP;
        printf("%12.6f %12.6f\n", x, y);
    }

    return 0;
}