public void DerivativeTest1()
{
IExpression exp = new Arccsc(new Mul(new Number(2), new Variable("x")));
IExpression deriv = exp.Differentiate();
Assert.AreEqual("-((2 * 1) / (abs(2 * x) * sqrt(((2 * x) ^ 2) - 1)))", deriv.ToString());
}
public void DerivativeTest2()
{
// arccsc(2x)
Number num = new Number(2);
Variable x = new Variable("x");
Mul mul = new Mul(num, x);
IExpression exp = new Arccsc(mul);
IExpression deriv = exp.Differentiate();
Assert.AreEqual("-((2 * 1) / (abs(2 * x) * sqrt(((2 * x) ^ 2) - 1)))", deriv.ToString());
num.Value = 4;
Assert.AreEqual("arccsc(4 * x)", exp.ToString());
Assert.AreEqual("-((2 * 1) / (abs(2 * x) * sqrt(((2 * x) ^ 2) - 1)))", deriv.ToString());
}
