
<!DOCTYPE math
  PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<math xmlns="http://www.w3.org/1998/Math/MathML">
<apply>
  <diff/>
  <bvar>
    <ci> x </ci>
    <degree>
      <cn> 2 </cn>
    </degree>
  </bvar>
  <apply>
    <power/>
    <ci> x </ci>
    <cn> 4 </cn>
  </apply>
</apply>
</math>
