a) \(\sqrt[3]{{{{\left( {1 - \sqrt 2 } \right)}^3}}} = 1 - \sqrt 2 \)
b) \(\sqrt[3]{{{{\left( {2\sqrt 2 + 1} \right)}^3}}} = 2\sqrt 2 + 1\)
c) \({\left( {\sqrt[3]{{\sqrt 2 + 1}}} \right)^3} = \sqrt 2 + 1\)
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