public void DerivativeTest2() { // ln(2x) Number num = new Number(2); Variable x = new Variable("x"); Mul mul = new Mul(num, x); IExpression exp = new Ln(mul); IExpression deriv = exp.Differentiate(); Assert.AreEqual("(2 * 1) / (2 * x)", deriv.ToString()); num.Value = 5; Assert.AreEqual("ln(5 * x)", exp.ToString()); Assert.AreEqual("(2 * 1) / (2 * x)", deriv.ToString()); }
public void LnDerivativeTest2() { // ln(2x) var num = new Number(2); var x = new Variable("x"); var mul = new Mul(num, x); var exp = new Ln(mul); var deriv = Differentiate(exp); Assert.Equal("(2 * 1) / (2 * x)", deriv.ToString()); num.Value = 5; Assert.Equal("ln(5 * x)", exp.ToString()); Assert.Equal("(2 * 1) / (2 * x)", deriv.ToString()); }