public void TestCalculateDerivative1()
        {
            decimal[]     functionParameters = new decimal[] { -3.0m, 2.0m, 6.0m, 5.0m };
            MetodaNewtona form = new MetodaNewtona();

            decimal[] result = form.CalculateDerivative(functionParameters);

            decimal[] result1 = new decimal[] { 4.0m, -9.0m, 6.0m };

            CollectionAssert.AreEquivalent(result1, result);
        }