public void Polynoms()
        {
            RealFunc f = (double x) => 1.0 / (1.0 + x * x);
            double   a = -9, b = 5;

            using (StreamWriter fs = new StreamWriter("Runge.txt"))
            {
                for (int i = 1; i < 30; i++)
                {
                    Polynom p = Polynom.Lag(f, i - 1, a, b);
                    fs.WriteLine($"{i} {FuncMethods.RealFuncMethods.NormDistanceС(f,p.Value,a,b)} {FuncMethods.RealFuncMethods.NormDistance(f, p.Value, a, b)}");
                }
            }
        }