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

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If a + 2b + c = 0; then show that :
a³ + 8b³ + c³ = 6abc.

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