Proof of proveit.numbers.exponentiation.cube_expansion theorem

import proveit
theory = proveit.Theory() # the theorem's theory

%proving cube_expansion

With these allowed/disallowed theorem/theory presumptions (e.g., to avoid circular dependencies), we begin our proof of
cube_expansion:
(see dependencies)

cube_expansion may now be readily provable (assuming required theorems are usable).  Simply execute "%qed".