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<a NAME="E1:28"/><i><font color="Green">E19</font></i>: 
 <a href="sin_cos.html#K22">cos</a>  <a href="hidden.html#R1">=</a>  <a href="toprealb.html#K6" target="_self">R^1</a> <a href="sin_cos.html#K22">cos</a> 
 
;<br/>
<a NAME="E2:28"/>
 <a href="relset_1.html#K4">dom</a> <a href="sin_cos.html#K22">cos</a>  <a href="hidden.html#R1">=</a>  <a href="numbers.html#K1">REAL</a> 
 
<b>by </b><i><a class="ref" href="sin_cos.html#D22">SIN_COS:def 22</a></i>;<br/>
<a NAME="E3:28"/><b>then </b>
<a href="topalg_2.html#K3">R^1</a>  <a href="pre_topc.html#K3">|</a> <span class="p1">(<span class="default"><a href="toprealb.html#K5" target="_self">R^1</a> <span class="p2">(<span class="default"><a href="relset_1.html#K4">dom</a> <a href="sin_cos.html#K22">cos</a> </span>)</span></span>)</span> <a href="hidden.html#R1">=</a>  <a href="topalg_2.html#K3">R^1</a> 
 
<b>by </b><i><a class="ref" href="toprealb.html#T6" target="_self">Th6</a></i>;<br/>
<a NAME="E4:28"/><b>then </b>
 <a href="sin_cos.html#K22">cos</a>  is   <a href="struct_0.html#NM7">Function</a> of <a href="topalg_2.html#K3">R^1</a> ,<span class="p1">(<span class="default"><a href="topalg_2.html#K3">R^1</a>  <a href="pre_topc.html#K3">|</a> <span class="p2">(<span class="default"><a href="toprealb.html#K5" target="_self">R^1</a> <span class="p3"><a href="rcomp_1.html#K1">[.</a><span class="default"><span class="p4">(<span class="default"><a href="real_1.html#K1">-</a> 1</span>)</span>,1</span><a href="rcomp_1.html#K1">.]</a></span></span>)</span></span>)</span>
 
<b>by </b><i><a class="txt" href="toprealb.html#E1:28"><i><font color="Green">E19</font></i></a>, <a class="ref" href="comptrig.html#T47">COMPTRIG:47</a></i>;<br/>
<b>hence </b><a NAME="E5:28"/>
 <a href="sin_cos.html#K22">cos</a>  is   <a href="struct_0.html#NM7">Function</a> of <a href="topalg_2.html#K3">R^1</a> ,<a href="topalg_2.html#K3">R^1</a> 
 <b>by </b><i><a class="ref" href="topreala.html#T28">TOPREALA:28</a></i>;<br/>


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