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= (3√2 x 3√2) + (3√2 x (-√3)) + (-√3 x 3√2) + (-√3 x (-√3))
= 9√4 + (-3√5) + (-3√5) + 3
= 18 - 6√5 + 3
= -6√5 + 18 + 3
= -6√5 + 21