#include <iostream>
#include <cmath>
 
using namespace std;
 
int main() {
    double a = 0.0;
    double b = 1.57;
    int n = 10;
 
    double dx = (b - a) / n;
    double x = a;
    double s = 0.0;
 
    double f1 = sin(x);
 
    for (int i = 1; i <= n; i++) {
        x = x + dx;
        double f2 = sin(x);
        s = s + dx * (f1 + f2) / 2.0;
        f1 = f2;
    }
 
    cout << "Przyblizona wartosc pola (s) = " << s << endl;
 
    return 0;
}

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