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f ( x ) = x + x + 1 2 x 2 + … and so on...

Source Code:

    <math> 
      <mi>f</mi> 
      <mrow> 
        <mo>(</mo> 
        <mi>x</mi> 
        <mo>)</mo> 
      </mrow> 
      <mo>=</mo> 
      <maction actiontype="toggle"> 
        <mrow> 
          <mi>x</mi> 
          <mo>+</mo> 
        </mrow> 
        <mrow> 
          <mi>x</mi> 
          <mo>+</mo> 
          <mfrac> 
            <mn>1</mn> 
            <mn>2</mn> 
          </mfrac> 
          <msup> 
            <mi>x</mi> 
            <mn>2</mn> 
          </msup> 
          <mo>+</mo> 
          <maction actiontype="statusline"> 
            <mpadded height="1ex">
              <mo>&hellip;</mo> 
            </mpadded>
            <mtext>and so on...</mtext> 
          </maction> 
        </mrow> 
      </maction> 
    </math>
  

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