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= 6^ (-6) . 12^(6) . a^(-6).a^(6)
= 6^(-6). 6^(6). 2^(6) a^(0)
= 6^0. a^0. 2^6
= 1 x 1 x 64
= 64
2.
(3√3 - 6)(√3 + 6) =
= 3√3(√3 + 6) - 6(√3 + 6)
= 9 + 18√3 - 6√3 - 36
= -27 + 12√3