\[\begin{array}{l} \left[ {{\text{Рамануджан}}} \right] \hfill \\ \sqrt[3]{{\sqrt[3]{2} - 1}} = \sqrt[3]{{\frac{1}{9}}} - \sqrt[3]{{\frac{2}{9}}} + \sqrt[3]{{\frac{4}{9}}} \hfill \\ \end{array}\]