public void FirstDerivativeWithSeveralVariables2()
{
var derivative = DifferentialCalculus.FirstDerivative(x => 8 * x[0] + x[0] * x[1], 0, 1, 1);
Assert.IsTrue(derivative == 9);
}
public void FirstDerivative()
{
var derivative = DifferentialCalculus.FirstDerivative(x => (double)3.2M * x * x, 1.0);
Assert.IsTrue(Math.Abs(derivative - (double)6.40000000000032M) < 1);
}
