#include <iostream>
#include <math.h>
using namespace std;
int main ()
{
    float x,n,y,xf,xk,h;
    cout<<"Enter the limits of variation of the parameter X"<<endl;
    cout<<"Xf"; cin>>xf; cout<<endl;
    cout<<"Xk"; cin>>xk; cout<<endl;
    cout<<"Enter a step change"; cin>>h; cout<<endl;
    cout<<"Enter n"; cin>>n; cout<<endl;
    for (x=xf;x<=xk;x+=h)
    {
        y=sin(n/x);
        if (y>0&&y<0.5*x) cout<<"y=sin("<<n<<"/"<<x<<")="<<y<<endl;
        y=-cos(n/x);
        if (y>0&&y<0.5*x) cout<<"y=-cos("<<n<<"/"<<x<<")="<<y<<endl;
    }
getchar();
}