static void YL14()
        {
            int algus = -90, lõpp = 90, samm = 10;
            //int algus = 270, lõpp = 450, samm = 10;
            double f1, f2, f3;
            for (int g = algus; g <= lõpp; g += samm)
            {
                double r = Math.PI * g / 180;
                f1 = Math.Cos(r);
                f2 = CosF(r, 5);
                f3 = CosF2(r, 5);
                Console.WriteLine("{0:N1} {1,9:N5} {2,9:N5} {3,9:N5}", g, f1, f2, f3);
            }
        }

        static double CosF(double x, int t)       // x-nurk t-täpsus
        {
            double Summa = 0;
            int n = 0;
            double An;
            do
            {
                An = AsteF(-1, n) * AsteF(x, 2 * n) / FactF(2 * n);
                Summa += An;
                n++;
            } while (Math.Abs(An) > Math.Pow(10, -t) && n < 1000);
            return Summa;
        }

        static double CosF2(double x, int t)       // x-nurk t-täpsus
        {
            int n = 0;
            double An = 1;
            double Summa = An;
            do
            {
                n++;
                double suhe = -x * x / (2 * n * (2 * n - 1));
                An = An * suhe;
                Summa += An;
            } while (Math.Abs(An) > Math.Pow(10, -t) && n < 1000);
            return Summa;
        }