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<b>let </b><font color="Maroon">z</font> be  <a href="xcmplx_0.html#V1">complex</a>  <a href="ordinal1.html#NM1" target="_self">number</a> ;<br/>

<a NAME="E1:44"/>
( ( 0 <a href="xxreal_0.html#R1">&lt;=</a>  <a href="comptrig.html#K1" target="_self">Arg</a> <font color="Maroon">z</font> &amp;  <a href="comptrig.html#K1" target="_self">Arg</a> <font color="Maroon">z</font> <a href="xxreal_0.html#NR3" target="_self">&lt;</a> 2 <a href="real_1.html#K4">*</a> <a href="sin_cos.html#K35">PI</a>  ) or <font color="Maroon">z</font> <a href="hidden.html#R1">=</a> 0 )
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E2:44"/>
( 0 <a href="xxreal_0.html#R1">&lt;=</a>  <a href="comptrig.html#K1" target="_self">Arg</a> <font color="Maroon">z</font> &amp;  <a href="comptrig.html#K1" target="_self">Arg</a> <font color="Maroon">z</font> <a href="xxreal_0.html#NR3" target="_self">&lt;</a> 2 <a href="real_1.html#K4">*</a> <a href="sin_cos.html#K35">PI</a>  )
 <b>by </b><i>, , </i>;<br/>


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