public void DerivativeTest3()
{
// (2x) / (3x)
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 Div(mul1, mul2);
IExpression deriv = exp.Differentiate();
Assert.AreEqual("(((2 * 1) * (3 * x)) - ((2 * x) * (3 * 1))) / ((3 * x) ^ 2)", deriv.ToString());
num1.Value = 4;
num2.Value = 5;
Assert.AreEqual("(4 * x) / (5 * x)", exp.ToString());
Assert.AreEqual("(((2 * 1) * (3 * x)) - ((2 * x) * (3 * 1))) / ((3 * x) ^ 2)", deriv.ToString());
}
public void DivDerivativeTest3()
{
// (2x) / (3x)
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 Div(mul1, mul2);
var deriv = Differentiate(exp);
Assert.Equal("((2 * 1 * 3 * x) - (2 * x * 3 * 1)) / ((3 * x) ^ 2)", deriv.ToString());
num1.Value = 4;
num2.Value = 5;
Assert.Equal("(4 * x) / (5 * x)", exp.ToString());
Assert.Equal("((2 * 1 * 3 * x) - (2 * x * 3 * 1)) / ((3 * x) ^ 2)", deriv.ToString());
}
