Question

$(2 + \sqrt{3})(2 - \sqrt{3})$
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Answer 1

$\to \: (2 + \sqrt{3})(2 - \sqrt{3}) \\ \\ \to \: ( {2}^{2} - {( \sqrt{3}) }^{2} ) \\ \\ \to \: 4 - 3 \\ \\ \to \: 1$