using System;
public class Program
{
public static double f(double x)
return 2 * Math.Sqrt(1-x*x);
}
public static void Main()
int n=50;
double a=-1, b=1;
double suma=0;
for (int i=0; i<n; i++)
suma +=(f(a+i*(b-a)/n)+f(a+(i+1)*(b-a)/n))/2*(b-a)/n;
Console.WriteLine($"El valor de la integral es: {suma}");