factorisex^2+1/x^2+2-2x-2/x
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Solution :
x² + 1/x² + 2 - 2x - 2/x
= (x²+1/x²+2*x*1/x)-2(x+1/x)
= (x+1/x)² - 2(x+1/x)
= (x+1/x)[ x + 1/x - 2 ]
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