public void DerivativeTest3()
{
// arccos(2x)
Number num = new Number(2);
Variable x = new Variable("x");
Mul mul = new Mul(num, x);
IExpression exp = new Arccos(mul);
IExpression deriv = exp.Differentiate();
Assert.AreEqual("-((2 * 1) / sqrt(1 - ((2 * x) ^ 2)))", deriv.ToString());
num.Value = 6;
Assert.AreEqual("arccos(6 * x)", exp.ToString());
Assert.AreEqual("-((2 * 1) / sqrt(1 - ((2 * x) ^ 2)))", deriv.ToString());
}
public void ArccosDerivativeTest3()
{
// arccos(2x)
var num = new Number(2);
var x = new Variable("x");
var mul = new Mul(num, x);
var exp = new Arccos(mul);
var deriv = Differentiate(exp);
Assert.Equal("-((2 * 1) / sqrt(1 - ((2 * x) ^ 2)))", deriv.ToString());
num.Value = 6;
Assert.Equal("arccos(6 * x)", exp.ToString());
Assert.Equal("-((2 * 1) / sqrt(1 - ((2 * x) ^ 2)))", deriv.ToString());
}
