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12 sqrt(6)-12sqrt(12) = 12 [sqrt(6)-sqrt(12)]

sqrt(6)=sqrt(2x3) = sqrt(2) x sqrt(3)

sqrt(12)=sqrt(22x3) = sqrt(22) x sqrt(3) = 2 sqrt(3)

sqrt(6) - sqrt(12) = sqrt(2) x sqrt(3) - 2 sqrt(3) = sqrt(3) [sqrt(2)-2]

So 12 sqrt(6)-12sqrt(12) = 12 sqrt(3) [sqrt(2)-2]

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