[tex] \sqrt{a- \sqrt{b} } = \sqrt{ \frac{a+c}{2} } -\sqrt{ \frac{a-c}{2} },\ unde\ c^2=b^2-a\\
c^2=3^2-5=>c=2\\
\sqrt{3- \sqrt{5} } = \sqrt{ \frac{3+2}{2} } -\sqrt{ \frac{3-2}{2} }=\sqrt{ \frac{5}{2} } -\sqrt{ \frac{1}{2} }= \frac{ \sqrt{5}-1 }{ \sqrt{2} }
[/tex]
