\setupbodyfont[xitsbidi]
\setupalign[r2l]
\setupmathematics[align=r2l]

\starttext
\startformula
\sqrt{𞸞^٢\over ٤𞸜} \eqno(٢)
\stopformula

\startformula
\sum^\infty_{𞹎=٠} 𞹎^٢ \eqno(٢)
\stopformula

\startformula
\left(\root{٢} \of{١٥٥}\right)
\stopformula

\startformula
\left[\int^{٥٥}_{١٢٣} ٦٦٦^٣\right]
\qquad\textstyle\left[\int^{٥٥}_{١٢٣} ٦٦٦^٣\right]
\stopformula

\startformula
\left\{\sum^{٥٥}_{١٢٣} ٦٦٦^٣\right\}
\stopformula

\startformula
\sqrt{\sqrt{\sqrt{\sqrt{\sqrt{\sqrt{\sqrt{\sqrt{\sqrt{\sqrt{٥٥}}}}}}}}}}
\stopformula

\startformula
٥ < ٦ > ٤
\stopformula

\startformula
٥ \leq ٦ \geq ٧
\stopformula
\stoptext