\(\sqrt{2-\sqrt{3}}=\frac{\sqrt{2}\sqrt{2-\sqrt{3}}}{\sqrt{2}}=\frac{\sqrt{2.\left(2-\sqrt{3}\right)}}{\sqrt{2}}=\frac{\sqrt{4-2\sqrt{3}}}{\sqrt{2}}\)
\(=\frac{\sqrt{3-2\sqrt{3}.1+1}}{\sqrt{2}}=\frac{\sqrt{\left(\sqrt{3}-1\right)^2}}{\sqrt{2}}=\frac{\sqrt{3}-1}{\sqrt{2}}=\frac{\sqrt{2}\sqrt{3}-\sqrt{2}}{2}\)
\(=\frac{\sqrt{6}-\sqrt{2}}{2}\)