x-1/x=4
(x-1/x)²=4²
x²-2+1/x²=16
x²+1/x²=18 , (x≠0)
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x-1/x=4
(x-1/x)²=4²
x²-2+1/x²=16
x²+1/x²=18 , (x≠0)