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<a NAME="E1:11"/>
0 <a href="hidden.html#R1">=</a>  <a href="real_1.html#K1">-</a> 0
 
;<br/>
<b>hence </b><a NAME="E2:11"/>
 <a href="real_1.html#K1">-</a> <span class="p1">(<span class="default"><a href="sin_cos.html#K35">PI</a>  <a href="real_1.html#K6">/</a> 2</span>)</span> <a href="xxreal_0.html#NR3" target="_self">&lt;</a> 0
 <b>by </b><i>, <a class="ref" href="xreal_1.html#T26">XREAL_1:26</a></i>;<br/>


</div>
