Pract_3

using System;
namespace console
{
    class Program
    {
        static void Main(string[] args)
        {
            string var;
            double x;
            Console.Write("Выберите формулу:\n1.first\n2.second\n3.third\n");
            var = Console.ReadLine();
            Console.Write("x:");
            x = Convert.ToInt32(Console.ReadLine());
            switch (var)
            {
                case "first":
                case "First":
                case "FIRST":
                    Console.Write("sin^2({0})={1:0.##}",x,Math.Pow(Math.Sin(x),2));
                    break;
                case "second":
                case "Second":
                case "SECOND":
                    Console.Write("log^2({0})={1:0.##}", x, Math.Pow(Math.Log(x), 2));
                    break;
                case "third":
                case "Third":
                case "THIRD":
                    Console.Write("1/cos({0}^3)={1:0.##}", x, 1/Math.Cos(Math.Pow(x,3)));
                    break;
                default:
                    Console.WriteLine("Проверте правильность написание формулы");
                    break;
            }
            Console.ReadLine();
        }
    }
}