\starttext

\type{$\left[ \sqrt{x} \right]$}: $\left[ \sqrt{x} \right]$

Without \type{\left} and \type{\right}: $[\sqrt{x}]$

\type{$\left( \sqrt{x} \right)$}: $\left( \sqrt{x} \right)$

With \type{\,}: \type{$\left[ \sqrt{x}\, \right]$}: $\left[ \sqrt{x}\, \right]$

\placeformula
\startformula
\left[ \sqrt{x} \right]
\stopformula

\CONTEXT\ \contextmark\ \contextversion
\stoptext