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1) x² + 1/x² = 18.
or, x² + 1/x² - 2 = 16
or, (x-1/x)² = 16
or, x-1/x =4.
4) x+y =12.
xy=32
x² + y² = (x+y)² - 2xy
or, x²+y² = 144 - 64.
or, x² + y² = 80.
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