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= (2-√3)² - (2+√3)² + 2(2+√3)(2-√3)
= (4 - 4√3 + 3) - (4 + 4√3 + 3) + 2(4-3)
=(7 - 4√3) - (7 + 4√3) + 2
=-8√3 + 2