Display:

( _ a b ) ‾

Source:


<mrow>
     <munder>
          <mo> ( </mo>
          <mo> &UnderBar; </mo>
     </munder>
     <mfrac>
          <mi> a </mi>
          <mi> b </mi>
     </mfrac>
     <mover>
          <mo> ) </mo>
          <mo> &OverBar; </mo>
     </mover>
</mrow>