x = (1/2 (sqrt(33) - 1))^(1/3) - 2 (2/(sqrt(33) - 1))^(1/3)
x = (1 - i sqrt(3)) (2/(sqrt(33) - 1))^(1/3) - 1/2 (1 + i sqrt(3)) (1/2 (sqrt(33) - 1))^(1/3)
x = (1 + i sqrt(3)) (2/(sqrt(33) - 1))^(1/3) + 1/2 i (sqrt(3) + i) (1/2 (sqrt(33) - 1))^(1/3)
0
-1