n><span class="hl std">,</span> <span class="hl str">&quot;noA3&quot;</span><span class="hl std">))</span><span class="hl opt">$</span><span class="hl std">x</span>
</pre></div>
<div class="output"><pre class="knitr r">  (((-t) * ((-t) * ((-t) * (-t) * (-s1) - ((-t) + (-t)) * (-2 * 
      (-s1) - (-t) * (-s1))) - (2 * (-s1) + (-t) * (-t) * (-2 * 
      (-s1) - (-t) * (-s1)))) - ((-s1) + (-t) * (2 * (-s1) + (-t) * 
      (-t) * (-2 * (-s1) - (-t) * (-s1))))) * px0 - ((1 - t) * 
      ((1 - t) * ((1 - t) * ((