[math-fun] For a mild surprise, try

https://lab.open.wolframcloud.com/objects/wpl/GetStarted.nb Overpaste the 2+2 with (-1 + 2^(1/3))^(1/6) Sqrt[1 + 2^(1/3)] Shift Enter (shift+return) On the next line type FullSimplify@% (shift+return) Optionally, type TraditionalForm[%%==%] (shift+return) —rwg