\(33-12\sqrt{6}=24-2.3.2\sqrt{6}+9=\left(2\sqrt{6}\right)^2-2.3.2\sqrt{6}+3^2=\left(2\sqrt{6}-3\right)^2\)
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\(33-12\sqrt{6}=24-2.3.2\sqrt{6}+9=\left(2\sqrt{6}\right)^2-2.3.2\sqrt{6}+3^2=\left(2\sqrt{6}-3\right)^2\)