3.6.13

#include <iostream>
#include <cmath>

using namespace std;
double f(float x) {
    if (x == 1 || x == -1) {
        return 1;
    }
    if (x >= 0 && x != 1) {
        return (-1 / (1 - x));
    }
    if (x < 0 && x != -1) {
        return (1 / (1 + x));
    }
}

int main() {
    float a, b, h, x;
    cin >> a >> b >> h;
    cout << "x\tf(x)\n";
    for (x = a; x <= b; x += h) {
        cout << x << "\t";
        cout << f(x);
        cout << endl;
    }
    return 0;
}