Когда нельзя ничего использовать

#include<iostream>
#include<string>
using namespace std;

int main() {
    setlocale(LC_ALL, "Russian");
    double x;
    double otvet_a, otvet_b, otvet_c;
    cout << "Введите x ";
    cin >> x;
    if (x <= 0) {
        cout << " 1/cos(x) не определен " << endl;
        if (1 + abs(x) > 1 + x * 2 * x)
            cout << "1 + x*2*x = " << 1 + x * 2 * x << " 1 + abs(x) =" << 1 + abs(x) << endl;
        else
            cout << " 1 + abs(x) =" << 1 + abs(x) << "1 + x*2*x = " << 1 + x * 2 * 1 << endl;
    }
    else
    {
        otvet_a = 1 / cos(x);
        otvet_b = 1 + abs(x);
        otvet_c = 1 + x * 2 * x;

        if (otvet_a < otvet_b && otvet_a < otvet_c) {
            if (otvet_b < otvet_c) {
                cout << "1/cos = " << otvet_a << endl;
                cout << " 1+x*2*x = " << otvet_b << endl;
                cout << " 1+abs(x) = " << otvet_c << endl;
            }
            else {
                cout << "1/cos = " << otvet_a << endl;
                cout << " 1+abs(x) = " << otvet_c << endl;
                cout << " 1+x*2*x = " << otvet_b << endl;
            }
        }

        if (otvet_b < otvet_a && otvet_b < otvet_c) {
            if (otvet_a < otvet_c) {
                cout << " 1+x*2*x = " << otvet_b << endl;
                cout << "1/cos = " << otvet_a << endl;
                cout << " 1+abs(x) = " << otvet_c << endl;
            }
            else {
                cout << " 1+x*2*x = " << otvet_b << endl;
                cout << " 1+abs(x) = " << otvet_c << endl;
                cout << "1/cos = " << otvet_a << endl;
            }
        }

        if (otvet_c < otvet_a && otvet_c < otvet_b) {
            if (otvet_a < otvet_b) {
                cout << " 1+abs(x) = " << otvet_c << endl;
                cout << "1/cos = " << otvet_a << endl;
                cout << " 1+x*2*x = " << otvet_b << endl;
            }
            else {
                cout << " 1+abs(x) = " << otvet_c << endl;
                cout << " 1+x*2*x = " << otvet_b << endl;
                cout << "1/cos = " << otvet_a << endl;
            }
        }
    }
}