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which expression is a sum of cubes?

the fourth expression:

Justification:

1) Find wich terms have exact cubic root

2) Given that 32 does not have exact cubic root, the second and third expressions can be discarded.

3) The first expression has a term with negative signs, so its cubic root will keep the negative signs, which will result a difference and not a sum of cubic terms.

4) That leads to the fourth expression, which I will analyze in detail:

First term:

=>

Second term:

=>

So, the fourth expression it the sum of two cubes: 

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