<apply>
<divide>
<apply>
<minus/>
<apply>
<minus/>
<apply>
<power/>
<ci>x</ci>
<cn>2</cn>
</apply>
<ci>x</ci>
</apply>
<cn>6</cn>
</apply>
<apply>
<plus/>
<ci>x</ci>
<cn>2</cn>
</apply>
</apply>