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\(\cfrac{1}{x}=\cfrac{1}{(2+√3)} \)
\(=\cfrac{(2-√3)}{(2+√3)(2-√3)}\)
\(=\cfrac{(2-√3)}{(2)^2-(√3)^2} \)
\(=\cfrac{2-√3}{4-3} \)
\(=2-√3\)

\(∴ x-\cfrac{1}{x}=(2+√3)-(2-√3)\)
\(=2+√3-2+√3\)
\(=2√3\)

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