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12. (3x-1/x)(3x-1/x) = 9x²-3/x-3/x-1/x² = 9x²-6/x-1/x²
= 16x² - 24x + 9
(3x - 1/x)² = (3x)² - 2(3x)(1/x) + (1/x)²
= 9x² - 6 + 1/x²