public void DerivativeTest3() { // sin(2x) Number num = new Number(2); Variable x = new Variable("x"); Mul mul = new Mul(num, x); IExpression exp = new Sin(mul); IExpression deriv = exp.Differentiate(); Assert.AreEqual("cos(2 * x) * (2 * 1)", deriv.ToString()); num.Value = 3; Assert.AreEqual("sin(3 * x)", exp.ToString()); Assert.AreEqual("cos(2 * x) * (2 * 1)", deriv.ToString()); }
public void SinDerivativeTest3() { // sin(2x) var num = new Number(2); var x = new Variable("x"); var mul = new Mul(num, x); var exp = new Sin(mul); var deriv = Differentiate(exp); Assert.Equal("cos(2 * x) * 2 * 1", deriv.ToString()); num.Value = 3; Assert.Equal("sin(3 * x)", exp.ToString()); Assert.Equal("cos(2 * x) * 2 * 1", deriv.ToString()); }