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<b>thus </b><a NAME="E1:4_4_1"/>
 <a href="sin_cos6.html#K4" title="SIN_COS6:func.4">arccos</a>  <a href="fcont_1.html#R2" title="FCONT_1:pred.2">is_continuous_on</a>  <a href="relset_1.html#K4" title="RELSET_1:func.4">dom</a> <a href="sin_cos6.html#K4" title="SIN_COS6:func.4">arccos</a> 
 <b>by </b><i><a class="ref" href="sin_cos6.html#T88" title="SIN_COS6:th.88">SIN_COS6:88</a>, <a class="ref" href="sin_cos6.html#T109" title="SIN_COS6:th.109">SIN_COS6:109</a></i>; <i><font color="Red">:: according to </font></i><a class="ref" href="jordan16.html#D1" title="JORDAN16:def.1">JORDAN16:def 1</a><br/>


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