public static double Derivative(Func <double, double> function, double number, double h, double eps)
{
return(MyMath.Within(eps, DerivativeApproximations(h, function, number)));
}
public static IEnumerable <double> DerivativeApproximations(double h0, Func <double, double> function, double number)
{
return(MyMath.Repeat(Halve, h0).Select(h => EasyDiff(function, number, h)));
}
public static double Square(double number, double startApproximation, double eps)
{
double NextApproximation(double startApprox) => GetNextApproximation(number, startApprox);
return(MyMath.Within(eps, MyMath.Repeat(NextApproximation, startApproximation)));
}