---

using System;

class Program
{
    static void Main()
    {
        double x;

        Console.Write("Введите x: ");
        x = double.Parse(Console.ReadLine());

        if (x == 0)
        {
            Console.WriteLine("Ошибка");
            return;
        }

        double F = x * Math.Cos(1.0 / x) + 2;

        Console.WriteLine("F = " + F);

        Console.ReadKey();
    }
}


using System;

class Program
{
    static void Main()
    {
        double x;

        Console.Write("Введите x: ");
        x = double.Parse(Console.ReadLine());

        double F = Math.Sin(x) + Math.Tan(x);

        Console.WriteLine("F = " + F);

        Console.ReadKey();
    }
}