Ah, I see your question now. The answers given when you tell it to show the steps are still in terms of complex numbers, they are just not expanded out. The description of the solution states that the answer is in terms of third roots of unity. And the results are shown in radical form, but are still complex numbers. The next step after what is shown would be to express does radical forms as the sum of a real and imaginary part yielding the final answer.
