x square +1 upon x square +2-2x -2 upon x
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x² + 1/x² + 2 - 2 x - 2 / x
= (x+1/x)² - 2(x+1/x)
= (x+1/x) (x+1/x - 2)
= (x+1/x)² - 2(x+1/x)
= (x+1/x) (x+1/x - 2)
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