Метод Ньютона

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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 Math.Tan(x) - (Math.Pow(Math.Tan(x), 3)) / 3 + (Math.Pow(Math.Tan(x), 5)) / 5 - 0.1 / 0.3;
}
static double sfunc(double x)
{
return (3*Math.Cos(4*x)+5)/Math.Pow(Math.Cos(x), 12)/8;
}
static void Main(string[] args)
{
double a = 0, b = 0.8;
double eps = 0.0001;
double x1 = 0, x2 = x1 - func(x1) / sfunc(x1);
while (Math.Abs(x2 - x1) > (Math.Sqrt(eps) / 10))
{
x1 = x2;
x2 = x1 - func(x1) / sfunc(x1);
}
double answer = x2;
Console.WriteLine("{0:f4}",answer);
Console.ReadKey();
}
}
}