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If 3x - (1/3x) = 5, find : (i) 9x^2 + (1/9x^2)

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If 3x - (1/3x) = 5, find :

(i) 9x2 + (1/9x2)

(ii) 81x4 + (1/81x4)

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= (27)2 - 2 = 729 - 2 = 727

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