Example ex2-01

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Next: ex2-02

a + b 2

<math>
 <mrow>
   <msup>
     <mfenced>
       <mrow>
         <mi>a</mi>
         <mo>+</mo>
         <mi>b</mi>
       </mrow>
     </mfenced>
     <mn>2</mn>
   </msup>
 </mrow>
</math>