#include <iostream> #include <cmath> using namespace std; int main() { double x, k, Z; cout << "Вариант 9" << endl; //cout << "Введите x" << endl; cin >> x; k = 1 + pow(x ,2); setlocale(LC_ALL,"Russian"); if (k <= 0) {cout << "Решений нет";} else { if (fabs(cos (x)) == 0) {cout << "Решений нет";} else { Z = log (fabs (cos(x))) / log (k) ;} ;} cout << "Z = " << Z << endl; return 0; }