public void DerivativeTest3() { // arctan(2x) Number num = new Number(2); Variable x = new Variable("x"); Mul mul = new Mul(num, x); IExpression exp = new Arctan(mul); IExpression deriv = exp.Differentiate(); Assert.AreEqual("(2 * 1) / (1 + ((2 * x) ^ 2))", deriv.ToString()); num.Value = 6; Assert.AreEqual("arctan(6 * x)", exp.ToString()); Assert.AreEqual("(2 * 1) / (1 + ((2 * x) ^ 2))", deriv.ToString()); }
public void ArctanDerivativeTest3() { // arctan(2x) var num = new Number(2); var x = new Variable("x"); var mul = new Mul(num, x); var exp = new Arctan(mul); var deriv = Differentiate(exp); Assert.Equal("(2 * 1) / (1 + ((2 * x) ^ 2))", deriv.ToString()); num.Value = 6; Assert.Equal("arctan(6 * x)", exp.ToString()); Assert.Equal("(2 * 1) / (1 + ((2 * x) ^ 2))", deriv.ToString()); }