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<b>let </b><font color="Maroon">y1</font> be   <a href="real_1.html#NM1">Real</a>;<br/><b>let </b><font color="Maroon">y2</font> be   <a href="real_1.html#NM1">Real</a>;<br/>



<span class="p1"><a href="euclid_5.html#K4" target="_self">|[</a><span class="default">0,<font color="Maroon">y1</font>,0</span><a href="euclid_5.html#K4" target="_self">]|</a></span> <a href="euclid_5.html#K5" target="_self">&lt;X&gt;</a> <span class="p1"><a href="euclid_5.html#K4" target="_self">|[</a><span class="default">0,<font color="Maroon">y2</font>,0</span><a href="euclid_5.html#K4" target="_self">]|</a></span> = 
<span class="p1"><a href="euclid_5.html#K4" target="_self">|[</a><span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">y1</font> <a href="binop_2.html#K11">*</a> 0</span>)</span> <a href="binop_2.html#K10">-</a> <span class="p3">(<span class="default">0 <a href="binop_2.html#K11">*</a> <font color="Maroon">y2</font></span>)</span></span>)</span>,<span class="p2">(<span class="default"><span class="p3">(<span class="default">0 <a href="binop_2.html#K24">*</a> 0</span>)</span> <a href="binop_2.html#K10">-</a> <span class="p3">(<span class="default">0 <a href="binop_2.html#K24">*</a> 0</span>)</span></span>)</span>,<span class="p2">(<span class="default"><span class="p3">(<span class="default">0 <a href="binop_2.html#K11">*</a> <font color="Maroon">y2</font></span>)</span> <a href="binop_2.html#K10">-</a> <span class="p3">(<span class="default"><font color="Maroon">y1</font> <a href="binop_2.html#K11">*</a> 0</span>)</span></span>)</span></span><a href="euclid_5.html#K4" target="_self">]|</a></span>
<b>by </b><i/>
<br/>.= 
<span class="p1"><a href="euclid_5.html#K4" target="_self">|[</a><span class="default"><span class="p2">(<span class="default">0 <a href="binop_2.html#K11">*</a> <span class="p3">(<span class="default"><font color="Maroon">y1</font> <a href="binop_2.html#K10">-</a> <font color="Maroon">y2</font></span>)</span></span>)</span>,<span class="p2">(<span class="default">0 <a href="binop_2.html#K11">*</a> <span class="p3">(<span class="default">0 <a href="binop_2.html#K10">-</a> 0</span>)</span></span>)</span>,<span class="p2">(<span class="default">0 <a href="binop_2.html#K11">*</a> <span class="p3">(<span class="default"><font color="Maroon">y2</font> <a href="binop_2.html#K10">-</a> <font color="Maroon">y1</font></span>)</span></span>)</span></span><a href="euclid_5.html#K4" target="_self">]|</a></span>

<br/>.= 
0 <a href="euclid.html#K18">*</a> <span class="p1"><a href="euclid_5.html#K4" target="_self">|[</a><span class="default"><span class="p2">(<span class="default"><font color="Maroon">y1</font> <a href="binop_2.html#K10">-</a> <font color="Maroon">y2</font></span>)</span>,<span class="p2">(<span class="default">0 <a href="binop_2.html#K10">-</a> 0</span>)</span>,<span class="p2">(<span class="default"><font color="Maroon">y2</font> <a href="binop_2.html#K10">-</a> <font color="Maroon">y1</font></span>)</span></span><a href="euclid_5.html#K4" target="_self">]|</a></span>
<b>by </b><i/>
<br/>.= 
 <a href="euclid.html#K16">0.REAL</a> 3
<b>by </b><i><a class="ref" href="euclid.html#T33">EUCLID:33</a></i>
;<br/>
<b>hence </b><a NAME="E2:23"/>
<span class="p1"><a href="euclid_5.html#K4" target="_self">|[</a><span class="default">0,<font color="Maroon">y1</font>,0</span><a href="euclid_5.html#K4" target="_self">]|</a></span> <a href="euclid_5.html#K5" target="_self">&lt;X&gt;</a> <span class="p1"><a href="euclid_5.html#K4" target="_self">|[</a><span class="default">0,<font color="Maroon">y2</font>,0</span><a href="euclid_5.html#K4" target="_self">]|</a></span> <a href="hidden.html#R1">=</a>  <a href="euclid.html#K16">0.REAL</a> 3
 ;<br/>


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