$\frac{ 1 }{ \sqrt{ 3 } } \times \frac{ \sqrt{ 3 } }{ \sqrt{ 3 } }$
To multiply the fractions, multiply the numerators and denominators separately$\frac{ 1\sqrt{ 3 } }{ \sqrt{ 3 }\sqrt{ 3 } }$
Any expression multiplied by $1$ remains the same$\frac{ \sqrt{ 3 } }{ \sqrt{ 3 }\sqrt{ 3 } }$
When a square root of an expression is multiplied by itself, the result is that expression$\begin{align*}&\frac{ \sqrt{ 3 } }{ 3 } \\&\approx0.57735\end{align*}$