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#include <iostream>
#include <math.h>
using namespace std;
float f(float a)
{
    return sqrt(a) * sin (4 * a);
}
int main()
{
    float dx, xmin, xmax;
    cout << "Enter start and end of span" << endl;
    cin >> xmin >> xmax;
    cout << "Enter sampling frequency" << endl;
    cin >> dx;
    for(float i = xmin; i <= xmax; i += dx)
    {
        cout << i << " " << f(i) << endl;
    }
    return 0;
}