If x-1/x = 8 find x²+1/x²
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(x - 1/x) = 8
so, (x - 1/x)^2 = 8^2
=> x^2 - 2.x.1/x + 1/x^2 = 64
=> x² + 1/x² = 64 + 2
=> (x² + 1/x²) = 66
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