public void DerivativeTest2()
{
Number num1 = new Number(2);
Variable x = new Variable("x");
Mul mul1 = new Mul(num1, x);
Number num2 = new Number(3);
Mul mul2 = new Mul(num2, x.Clone());
IExpression exp = new Sub(mul1, mul2);
IExpression deriv = exp.Differentiate();
Assert.AreEqual("(2 * 1) - (3 * 1)", deriv.ToString());
num1.Value = 5;
num2.Value = 4;
Assert.AreEqual("(5 * x) - (4 * x)", exp.ToString());
Assert.AreEqual("(2 * 1) - (3 * 1)", deriv.ToString());
}
public void SubDerivativeTest2()
{
var num1 = new Number(2);
var x = new Variable("x");
var mul1 = new Mul(num1, x);
var num2 = new Number(3);
var mul2 = new Mul(num2, x.Clone());
var exp = new Sub(mul1, mul2);
var deriv = Differentiate(exp);
Assert.Equal("(2 * 1) - (3 * 1)", deriv.ToString());
num1.Value = 5;
num2.Value = 4;
Assert.Equal("(5 * x) - (4 * x)", exp.ToString());
Assert.Equal("(2 * 1) - (3 * 1)", deriv.ToString());
}