 </span><span class="c1"># Vector Tripple Product Identity</span><span class="w">
</span><span class="gp unselectable">...&gt; </span><span class="n">a</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p" data-group-id="3725611105-1">{</span><span class="mi">2</span><span class="p">,</span><span class="w"> </span><span class="mi">3</span><span class="p">,</span><span class="w"> </span><span class="mi">1</span><span class="p" data-group-id="3725611105-1">}</span><span