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(2√3 + √2) (2√3 - √2)
↓ ↓ ↓ ↓
a b a b
(2√3)(2√3) + (2√3)(-√2) + (√2)(2√3) + (√2)(-√2)
4√9 - 2√6 + 2√6 - 2
12 - 2
10