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`2) A = \sqrt{4 - 2\sqrt{3}} + \sqrt{4 + 2\sqrt{3}}`

`A = \sqrt{3 - 2\sqrt{3} + 1} + \sqrt{3 + 2\sqrt{3} + 1}`

`A = \sqrt{(\sqrt{3}-1)^2}+\sqrt{(\sqrt{3}+1)^2}`

`A = \sqrt{3} - 1 + \sqrt{3} + 1`

`A = 2\sqrt{3}`

`4) A = \sqrt{4 + 2\sqrt{3}} - \sqrt{4 - 2\sqrt{3}}`

`A = \sqrt{3 + 2\sqrt{3} + 1} - \sqrt{3 - 2\sqrt{3} + 1}`

`A = \sqrt{(\sqrt{3}+1)^2}  - \sqrt{(\sqrt{3}-1)^2}`

`A = \sqrt{3} + 1 - \sqrt{3} + 1`

`A = 2`

`6) A = \sqrt{3 + 2\sqrt{2}} + \sqrt{3 - 2\sqrt{2}}`

`A = \sqrt{2 + 2\sqrt{2} + 1} + \sqrt{2 - 2\sqrt{2} + 1}`

`A = \sqrt{(\sqrt{2}+1)^2}+\sqrt{(\sqrt{2}-1)^2}`

`A = \sqrt{2} + 1 + \sqrt{2} - 1`

`A = 2\sqrt{2}`

`8) A = \sqrt{8 - 2\sqrt{7}} - \sqrt{8 + 2\sqrt{7}}`

`A = \sqrt{7 - 2\sqrt{7}+ 1} - \sqrt{7 + 2\sqrt{7}+1}`

`A = \sqrt{(\sqrt{7}-1)^2}-\sqrt{(\sqrt{7}+1)^2}`

`A = \sqrt{7} - 1 - \sqrt{7} - 1`

`A = -2`

`10) A = \sqrt{28 + 10\sqrt{3}} + \sqrt{19 - 8\sqrt{3}}`

`A = \sqrt{25 + 2 . 5\sqrt{3} + 3} + \sqrt{16 - 2 . 4\sqrt{3} + 3}`

`A = \sqrt{( 5 + \sqrt{3})^2} + \sqrt{( 4 - \sqrt{3})^2}`

`A = 5 + \sqrt{3} + 4 - \sqrt{3}`

`A = 9`