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<a NAME="E1:127"/>
 <a href="sin_cos.html#K35" target="_self">PI</a>  <a href="hidden.html#R2">in</a> <span class="p1"><a href="rcomp_1.html#K2">].</a><span class="default">0,4</span><a href="rcomp_1.html#K2">.[</a></span>
 
<b>by </b><i/>;<br/>
<a NAME="E2:127"/><b>then </b>
( 0 <a href="xxreal_0.html#R1">&lt;</a>  <a href="sin_cos.html#K35" target="_self">PI</a>  &amp;  <a href="sin_cos.html#K35" target="_self">PI</a>  <a href="xxreal_0.html#R1">&lt;</a> 4 )
 
<b>by </b><i><a class="ref" href="rcomp_1.html#T47">RCOMP_1:47</a></i>;<br/>
<a NAME="E3:127"/><b>then </b>
( 0 <a href="real_1.html#K6">/</a> 4 <a href="xxreal_0.html#R1">&lt;</a> <a href="sin_cos.html#K35" target="_self">PI</a>  <a href="real_1.html#K6">/</a> 4 &amp; <a href="sin_cos.html#K35" target="_self">PI</a>  <a href="real_1.html#K6">/</a> 4 <a href="xxreal_0.html#R1">&lt;</a> 4 <a href="real_1.html#K6">/</a> 4 )
 
<b>by </b><i><a class="ref" href="real_1.html#T73">REAL_1:73</a></i>;<br/>
<a NAME="E4:127"/><b>then </b><i><font color="Green">E53</font></i>: 
<a href="sin_cos.html#K35" target="_self">PI</a>  <a href="real_1.html#K6">/</a> 4 <a href="hidden.html#R2">in</a> <span class="p1"><a href="rcomp_1.html#K2">].</a><span class="default">0,1</span><a href="rcomp_1.html#K2">.[</a></span>
 
<b>by </b><i><a class="ref" href="rcomp_1.html#T47">RCOMP_1:47</a></i>;<br/>
<a NAME="E5:127"/>
<a href="sin_cos.html#K32" target="_self">tan</a>  <a href="seq_1.html#K2">.</a> <span class="p1">(<span class="default"><a href="sin_cos.html#K35" target="_self">PI</a>  <a href="real_1.html#K6">/</a> 4</span>)</span> <a href="hidden.html#R1">=</a> 1
 
<b>by </b><i/>;<br/>
<a NAME="E6:127"/><b>then </b>
<span class="p1">(<span class="default"><a href="sin_cos.html#K19" target="_self">sin</a>  <a href="seq_1.html#K2">.</a> <span class="p2">(<span class="default"><a href="sin_cos.html#K35" target="_self">PI</a>  <a href="real_1.html#K6">/</a> 4</span>)</span></span>)</span> <a href="real_1.html#K4">*</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="sin_cos.html#K22" target="_self">cos</a>  <a href="seq_1.html#K2">.</a> <span class="p3">(<span class="default"><a href="sin_cos.html#K35" target="_self">PI</a>  <a href="real_1.html#K6">/</a> 4</span>)</span></span>)</span> <a href="real_1.html#K2">"</a> </span>)</span> <a href="hidden.html#R1">=</a> 1
 
<b>by </b><i>, , <a class="ref" href="rfunct_1.html#D4">RFUNCT_1:def 4</a></i>;<br/>
<b>hence </b><a NAME="E7:127"/>
<a href="sin_cos.html#K19" target="_self">sin</a>  <a href="seq_1.html#K2">.</a> <span class="p1">(<span class="default"><a href="sin_cos.html#K35" target="_self">PI</a>  <a href="real_1.html#K6">/</a> 4</span>)</span> <a href="hidden.html#R1">=</a> <a href="sin_cos.html#K22" target="_self">cos</a>  <a href="seq_1.html#K2">.</a> <span class="p1">(<span class="default"><a href="sin_cos.html#K35" target="_self">PI</a>  <a href="real_1.html#K6">/</a> 4</span>)</span>
 <b>by </b><i><a class="ref" href="xcmplx_1.html#T210">XCMPLX_1:210</a></i>;<br/>


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