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= 2akar6 . 2akar6 + 2akar6 . 3akar3 - 3akar3 . 2akar6 - 3akar3 . 3akar3
= 4akar36 - 9akar9
= (4 . 6) - (9 . 3)
= 24 - 27
= -3 (b)