public void DerivativeTest2() { IExpression exp = new Cos(new Mul(new Number(2), new Variable("x"))); IExpression deriv = exp.Differentiate(); Assert.AreEqual("-(sin(2 * x) * (2 * 1))", deriv.ToString()); }
public void DerivativeTest1() { IExpression exp = new Cos(new Variable("x")); IExpression deriv = exp.Differentiate(); Assert.AreEqual("-(sin(x) * 1)", deriv.ToString()); }
public void DerivativeTest3() { // cos(2x) Number num = new Number(2); Variable x = new Variable("x"); Mul mul = new Mul(num, x); IExpression exp = new Cos(mul); IExpression deriv = exp.Differentiate(); Assert.AreEqual("-(sin(2 * x) * (2 * 1))", deriv.ToString()); num.Value = 7; Assert.AreEqual("cos(7 * x)", exp.ToString()); Assert.AreEqual("-(sin(2 * x) * (2 * 1))", deriv.ToString()); }
public void PartialDerivativeTest3() { IExpression exp = new Cos(new Variable("x")); IExpression deriv = exp.Differentiate(new Variable("y")); Assert.AreEqual("0", deriv.ToString()); }
public void PartialDerivativeTest2() { IExpression exp = new Cos(new Mul(new Variable("x"), new Variable("y"))); IExpression deriv = exp.Differentiate(new Variable("y")); Assert.AreEqual("-(sin(x * y) * (x * 1))", deriv.ToString()); }