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= 2√2 . √2 + 2√2 . √6 + (-√6).√2 + (-√6).√6
= 2.√4 + 2.√12 - √12 - √36
= 2.2 + 2.√(4.3) - √(4.3) - 6
= 4 + 2.2√3 - 2√3 - 6
= 4 + 4√3 - 2√3 - 6
= 4 - 6 + 4√3 - 2√3
= -2 + 2√3
atau
2√3 - 2