(x²+1/x²) + 18(x-1/x) +79 :- Factorise
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Step-by-step explanation:
(x+1/x)² = x²+1/x² + 2
x²+1/x² = (x+1/x)²-2
(x-1/x)² = x²+1/x² - 2
x²+1/x² = (x-1/x)²+2
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