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<b>thus </b><a NAME="E1:4_2_1"/>
 <a href="sin_cos.html#K22">cos</a>  <a href="fcont_1.html#R2">is_continuous_on</a>  <a href="relset_1.html#K4">dom</a> <a href="sin_cos.html#K22">cos</a> 
 <b>by </b><i><a class="ref" href="comptrig.html#T44">COMPTRIG:44</a>, <a class="ref" href="sin_cos.html#D22">SIN_COS:def 22</a></i>; <i><font color="Red">:: according to </font></i><a class="ref" href="jordan16.html#D1">JORDAN16:def 1</a><br/>


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