public void DerivativeTest3() { // cot(2x) Number num = new Number(2); Variable x = new Variable("x"); Mul mul = new Mul(num, x); IExpression exp = new Cot(mul); IExpression deriv = exp.Differentiate(); Assert.AreEqual("-((2 * 1) / (sin(2 * x) ^ 2))", deriv.ToString()); num.Value = 3; Assert.AreEqual("cot(3 * x)", exp.ToString()); Assert.AreEqual("-((2 * 1) / (sin(2 * x) ^ 2))", deriv.ToString()); }
public void CotDerivativeTest3() { // cot(2x) var num = new Number(2); var x = new Variable("x"); var mul = new Mul(num, x); var exp = new Cot(mul); var deriv = Differentiate(exp); Assert.Equal("-((2 * 1) / (sin(2 * x) ^ 2))", deriv.ToString()); num.Value = 3; Assert.Equal("cot(3 * x)", exp.ToString()); Assert.Equal("-((2 * 1) / (sin(2 * x) ^ 2))", deriv.ToString()); }