If a ≠ 0 and a - 1/a = 4 ; find : (i) a^2 + 1/a^2 (ii) a^4 + 1/a^4 (iii) a^3 - 1/a^3

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Use property to evaluate:
(i) 9³ - 5³ - 4³
(ii) 38³ + (-26)³ + (-12)³

If 2x - 3y = 10 and xy = 16, find the value of 8x³ - 27y³.