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());
}