using System;
 
class Program
{
    static void Main()
    {
        Console.Write("Введіть x: ");
        double x = Convert.ToDouble(Console.ReadLine().Replace(",", "."));
 
        Console.Write("Введіть y: ");
        double y = Convert.ToDouble(Console.ReadLine().Replace(",", "."));
 
        double numerator = Math.Pow((2 + y*y), (x + y/2));
        double denominator = y*y + 1/(1 + y*y);
 
        double a = numerator / denominator;
 
        Console.WriteLine("Результат a = " + a);
    }
}

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0.22
 -6.72