3. [TEX]\sqrt{14+\sqrt{40}+\sqrt{56}+\sqrt{140}}-\sqrt{12+2\sqrt{35}}-\sqrt{2}[/TEX]
[TEX]= \sqrt{2+5+7+2\sqrt{10}+2\sqrt{14}+2\sqrt{35}}-\sqrt{7+5+2\sqrt{35}}-\sqrt{2}[/TEX]
[TEX]= \sqrt{(\sqrt{2}+\sqrt{5}+\sqrt{7})^2}-\sqrt{(\sqrt{7}+\sqrt{5})^2}-\sqrt{2}[/TEX]
[TEX]= |\sqrt{2}+\sqrt{5}+\sqrt{7}|-|\sqrt{7}+\sqrt{5}|-\sqrt{2}[/TEX]
[TEX]=\sqrt{2}+\sqrt{5}+\sqrt{7}-\sqrt{7}-\sqrt{5}-\sqrt{2} = 0[/TEX]