private static FloatingPoint CalculateFunctionAtDerivative(
            this Expr symbolicExpression,
            Dictionary <string, FloatingPoint> variables,
            Expr variableForDerivative,
            int derivativeDegree)
        {
            var functionAtDerivative = symbolicExpression.GetDerivativeOfDegree(variableForDerivative, derivativeDegree);

            return(functionAtDerivative.Evaluate(variables));
        }