$\displaystyle \frac{1}{\sqrt5}$\displaystyle \frac{1}{\sqrt5}

$\displaystyle \frac{2}{\sqrt5}$\displaystyle \frac{2}{\sqrt5}

$\displaystyle \frac{\sqrt5}{3}$\displaystyle \frac{\sqrt5}{3}

$\displaystyle \frac{3}{\sqrt{10}}$\displaystyle \frac{3}{\sqrt{10}}