//clang 6.0.0
#include <iostream>
#include <cmath>

using namespace std;

int main() 
{
    setlocale (LC_ALL, "rus");
	float x, a=0.5, b=0.8, s;
	const float e=2.71;
	cout << "Введите x= ";
	cin >> x;
	cout << endl;
	if ((x<=1) && (x>=-1 ))
    {
	s=(pow(e,-a*x)*cos(x))+(pow(e,-b*x)*sin(x));
	cout <<"S="<< s;
    }
    else
       cout <<"Вычисление невозможно";
    return 0;
}