Метод итерации

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ConsoleApplication1
{
class Program
{
static double func(double x)
{
return x - (Math.Tan(x) - (Math.Pow(Math.Tan(x), 3)) / 3 + (Math.Pow(Math.Tan(x), 5)) / 5 - 0.1 / 0.3);
}
static void Main(string[] args)
{
double a = 0, b = 0.8;
double eps = 0.0001;
double numbers = 1;
double x1 = func((a + b) / 2), x2 = func(x1);
while (Math.Abs(x2 - x1) > eps)
{
x1 = x2;
x2 = func(x1);
numbers += 1;
}
double answer = x2;
Console.WriteLine("Answer:{0:f4}\nNumbers:{1}", answer, numbers);
Console.ReadKey();
}
}
}