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\left(\sqrt{3}-2\sqrt{3}\right)^{2}-1
Factor 12=2^{2}\times 3. Rewrite the square root of the product \sqrt{2^{2}\times 3} as the product of square roots \sqrt{2^{2}}\sqrt{3}. Take the square root of 2^{2}.
\left(-\sqrt{3}\right)^{2}-1
Combine \sqrt{3} and -2\sqrt{3} to get -\sqrt{3}.
\left(-1\right)^{2}\left(\sqrt{3}\right)^{2}-1
Expand \left(-\sqrt{3}\right)^{2}.
1\left(\sqrt{3}\right)^{2}-1
Calculate -1 to the power of 2 and get 1.
1\times 3-1
The square of \sqrt{3} is 3.
3-1
Multiply 1 and 3 to get 3.
2
Subtract 1 from 3 to get 2.