\(=\sqrt{\sqrt{2}+\sqrt{6}+\sqrt{3}+3}-\sqrt{2+\sqrt{3}}\)
\(=\sqrt{\sqrt{2}\left(1+\sqrt{3}\right)+\sqrt{3}\left(1+\sqrt{3}\right)}-\sqrt{2-\sqrt{3}}\)
\(=\sqrt{\left(\sqrt{2}+\sqrt{3}\right)\left(1+\sqrt{3}\right)}-\sqrt{2-\sqrt{3}}\)
Nếu đề là \(\sqrt{\sqrt{2}+\sqrt{3}+\sqrt{6}+3}-\sqrt{\sqrt{2}+\sqrt{3}}\) thì ok