2) `\sqrt{(2\sqrt{6}-4)^2}+\sqrt{(\sqrt{6}-3)^2}`
`=|2\sqrt{6}-4|+|\sqrt{6}-3|`
`=2\sqrt{6}-4+3-\sqrt{6}`
`=\sqrt{6}-1`
3) `\sqrt{4-2\sqrt{3}}-\sqrt{7+4\sqrt{3}}`
`=\sqrt{3-2\sqrt{3}+1}-\sqrt{4+4\sqrt{3}+3}`
`=\sqrt{(\sqrt{3}-1)^2}-\sqrt{(\sqrt{4}+3)^2}`
`=|\sqrt{3}-1|-|\sqrt{4}+\sqrt{3}|`
`=\sqrt{3}-1-\sqrt{4}-\sqrt{3}`
`=\sqrt{3}-1-2-\sqrt{3}`
`=-3`
