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       Mathematical expression
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       Mathematical expression
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       !let ins_align=middle
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       !let ins_align=middle
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    !! we need to force dynamic insertion
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    !! we need to force dynamic insertion
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       !set pw=2
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       !set pw=2
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       <pre>
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       <pre>
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        !insmath x_{1,2} = \frac{-b \pm \sqrt{b^{$pw} - 4ac}}{2a}
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        !insmath x_{1,2} = \frac{-b \pm \sqrt{b^{$pw} - 4a c}}{2a}
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       </pre>
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       </pre>
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      </li>
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      </li>
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      <li>
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      <li>
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       A mixed inequality:
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       A mixed inequality:
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        <pre>
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        <pre>