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$\left(\frac{y}{z}\right)+\left(\frac{y}{z}\right)$

Source Code:

    <math> 
      <mstyle minsize='1cm' maxsize='3cm'> 
        <mrow> 
          <mo>(</mo> 
          <mfrac> 
            <mi>y</mi> 
            <mi>z</mi> 
          </mfrac> 
          <mo maxsize='25%'>)</mo> 
          <mo>+</mo> 
          <mo minsize='225%'>(</mo> 
          <mfrac> 
            <mi>y</mi> 
            <mi>z</mi> 
          </mfrac> 
          <mo maxsize='infinity'>)</mo> 
        </mrow> 
      </mstyle> 
    </math>