Display:

$f\⁡\left(x,y\right)$

Source:

<mrow>
     <mi> f </mi>
     <mo> &ApplyFunction; </mo>
     <mrow>
          <mo> ( </mo>
          <mrow>
               <mi> x </mi>
               <mo> , </mo>
               <mi> y </mi>
          </mrow>
          <mo> ) </mo>
     </mrow>
</mrow>