If a + 1/a = 6 and a ≠ 0; find : (i) a - 1/a (ii) a^2 - 1/a^2

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If a - b = 0.9 and ab = 0.36; find :
(i) a + b
(ii) a² - b²

If a - b = 4 and a + b = 6; find :
(i) a² + b²
(ii) ab