public void TestGetDerivative2()
{
string polyString = "4*X^2*Y^4 - 4*X*Y^2 + 1";
string expected = "8*X*Y^4 - 4*Y^2";
MultivariatePolynomial poly = MultivariatePolynomial.Parse(polyString);
MultivariatePolynomial derivative = MultivariatePolynomial.GetDerivative(poly, 'X');
string actual = derivative.ToString();
TestContext.WriteLine($"Expected: \"{expected}\"; Actual: \"{actual}\"");
Assert.AreEqual(expected, actual, $"Test of: MultivariatePolynomial.GetDerivative({polyString});");
}
