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2(2) + 2(- √3) + √3(2) + √3(- √3)
4 - √6 + √6 - 3
4 - 3
1
=2(2) + 2(- √3) + √3(2) + √3(- √3)
=4 - √6 + √6 - 3
=4 - 3
=1