<?xml version="1.0"?>
<div class="add">

<b>let </b><font color="Maroon">a</font> be  <a href="xcmplx_0.html#V1">complex</a>  <a href="ordinal1.html#NM1" target="_self">number</a> ;<br/><b>let </b><font color="Maroon">r</font> be   <a href="real_1.html#NM1">Real</a>;<br/>



<b>assume </b><a NAME="E1:28"/><i><font color="Green">E23</font></i>: 
<font color="Maroon">r</font> <a href="xxreal_0.html#NR4" target="_self">&gt;</a> 0
 ;<br/>

<div><a class="txt" onclick="hsNdiv(this)" href="javascript:()" title="28_1"><b>per </b></a><a class="txt" onclick="hs(this)" href="javascript:()"><b>cases </b></a><span class="hide"><a NAME="E1:28_1"/>
( <font color="Maroon">a</font> <a href="hidden.html#R1">=</a> 0 or <font color="Maroon">a</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> 0 )
 </span>;<br/><div class="add"><div><a class="txt" onclick="hsNdiv(this)" href="javascript:()" title="28_1_1"><b>suppose </b></a><a NAME="E1:28_1_1"/>
<font color="Maroon">a</font> <a href="hidden.html#R1">=</a> 0
 ;<br/><div class="add"><b>hence </b><a NAME="E2:28_1_1"/>
 <a href="comptrig.html#K1">Arg</a> <span class="p1">(<span class="default"><font color="Maroon">a</font> <a href="xcmplx_0.html#K3">*</a> <span class="p2"><a href="arytm_0.html#K5">[*</a><span class="default"><font color="Maroon">r</font>,0</span><a href="arytm_0.html#K5">*]</a></span></span>)</span> <a href="hidden.html#R1">=</a>  <a href="comptrig.html#K1">Arg</a> <font color="Maroon">a</font>
 ;<br/></div><b>end;</b></div><div><a class="txt" onclick="hsNdiv(this)" href="javascript:()" title="28_1_2"><b>suppose </b></a><a NAME="E1:28_1_2"/><i><font color="Green">E26</font></i>: 
<font color="Maroon">a</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> 0
 ;<br/><div class="add"><b>set </b><font color="Maroon">b</font> = <font color="Maroon">a</font> <a href="xcmplx_0.html#K3">*</a> <span class="p1"><a href="arytm_0.html#K5">[*</a><span class="default"><font color="Maroon">r</font>,0</span><a href="arytm_0.html#K5">*]</a></span>;<br/><a NAME="E2:28_1_2"/><i><font color="Green">E29</font></i>: 
<span class="p1"><a href="arytm_0.html#K5">[*</a><span class="default"><font color="Maroon">r</font>,0</span><a href="arytm_0.html#K5">*]</a></span> <a href="hidden.html#R1">=</a> <font color="Maroon">r</font> <a href="xcmplx_0.html#K2">+</a> <span class="p1">(<span class="default">0 <a href="xcmplx_0.html#K3">*</a> <a href="complex1.html#K7">&lt;i&gt;</a> </span>)</span>
 <b>by </b><i><a class="ref" href="complex1.html#T27">COMPLEX1:27</a></i>;<br/><a NAME="E3:28_1_2"/><b>then </b><i><font color="Green">E30</font></i>: 
(  <a href="complex1.html#K3">Re</a> <span class="p1"><a href="arytm_0.html#K5">[*</a><span class="default"><font color="Maroon">r</font>,0</span><a href="arytm_0.html#K5">*]</a></span> <a href="hidden.html#R1">=</a> <font color="Maroon">r</font> &amp;  <a href="complex1.html#K4">Im</a> <span class="p1"><a href="arytm_0.html#K5">[*</a><span class="default"><font color="Maroon">r</font>,0</span><a href="arytm_0.html#K5">*]</a></span> <a href="hidden.html#R1">=</a> 0 )
 <b>by </b><i><a class="ref" href="complex1.html#T28">COMPLEX1:28</a></i>;<br/><b>then </b><i><font color="Green">E31</font></i>:  <a href="complex1.html#K3">Re</a> <span class="p1">(<span class="default"><font color="Maroon">a</font> <a href="xcmplx_0.html#K3">*</a> <span class="p2"><a href="arytm_0.html#K5">[*</a><span class="default"><font color="Maroon">r</font>,0</span><a href="arytm_0.html#K5">*]</a></span></span>)</span> = 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="complex1.html#K3">Re</a> <font color="Maroon">a</font></span>)</span> <a href="real_1.html#K4">*</a> <font color="Maroon">r</font></span>)</span> <a href="real_1.html#K5">-</a> <span class="p1">(<span class="default">0 <a href="real_1.html#K4">*</a> <span class="p2">(<span class="default"><a href="complex1.html#K4">Im</a> <font color="Maroon">a</font></span>)</span></span>)</span>
<b>by </b><i><a class="ref" href="complex1.html#T24">COMPLEX1:24</a></i>
<br/>.= 
<font color="Maroon">r</font> <a href="real_1.html#K4">*</a> <span class="p1">(<span class="default"><a href="complex1.html#K3">Re</a> <font color="Maroon">a</font></span>)</span>

;<br/><i><font color="Green">E32</font></i>:  <a href="complex1.html#K4">Im</a> <span class="p1">(<span class="default"><font color="Maroon">a</font> <a href="xcmplx_0.html#K3">*</a> <span class="p2"><a href="arytm_0.html#K5">[*</a><span class="default"><font color="Maroon">r</font>,0</span><a href="arytm_0.html#K5">*]</a></span></span>)</span> = 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="complex1.html#K3">Re</a> <font color="Maroon">a</font></span>)</span> <a href="real_1.html#K4">*</a> 0</span>)</span> <a href="real_1.html#K3">+</a> <span class="p1">(<span class="default"><font color="Maroon">r</font> <a href="real_1.html#K4">*</a> <span class="p2">(<span class="default"><a href="complex1.html#K4">Im</a> <font color="Maroon">a</font></span>)</span></span>)</span>
<b>by </b><i><a class="txt" href="complex2.html#E4:28_1_2"><i><font color="Green">E31</font></i></a>, <a class="ref" href="complex1.html#T24">COMPLEX1:24</a></i>
<br/>.= 
<font color="Maroon">r</font> <a href="real_1.html#K4">*</a> <span class="p1">(<span class="default"><a href="complex1.html#K4">Im</a> <font color="Maroon">a</font></span>)</span>

;<br/><i><font color="Green">E33</font></i>: <span class="p1"><a href="complex1.html#K17">|.</a><span class="default"><span class="p2">(<span class="default"><font color="Maroon">a</font> <a href="xcmplx_0.html#K3">*</a> <span class="p3"><a href="arytm_0.html#K5">[*</a><span class="default"><font color="Maroon">r</font>,0</span><a href="arytm_0.html#K5">*]</a></span></span>)</span></span><a href="complex1.html#K17">.|</a></span> = 
<span class="p1"><a href="complex1.html#K17">|.</a><span class="default"><font color="Maroon">a</font></span><a href="complex1.html#K17">.|</a></span> <a href="real_1.html#K4">*</a> <span class="p1">(<span class="default"><a href="complex1.html#K18">abs</a> <font color="Maroon">r</font></span>)</span>
<b>by </b><i><a class="txt" href="complex2.html#E3:28_1_2"><i><font color="Green">E30</font></i></a>, <a class="ref" href="complex1.html#T151">COMPLEX1:151</a></i>
<br/>.= 
<span class="p1"><a href="complex1.html#K17">|.</a><span class="default"><font color="Maroon">a</font></span><a href="complex1.html#K17">.|</a></span> <a href="real_1.html#K4">*</a> <font color="Maroon">r</font>
<b>by </b><i>, <a class="ref" href="absvalue.html#D1">ABSVALUE:def 1</a></i>
;<br/><a NAME="E7:28_1_2"/>
<span class="p1"><a href="complex1.html#K17">|.</a><span class="default"><font color="Maroon">a</font></span><a href="complex1.html#K17">.|</a></span> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> 0
 <b>by </b><i><a class="txt" href="complex2.html#E2:28_1_2"><i><font color="Green">E29</font></i></a>, <a class="ref" href="complex1.html#T131">COMPLEX1:131</a></i>;<br/><a NAME="E8:28_1_2"/><b>then </b><i><font color="Green">E48</font></i>: 
<span class="p1"><a href="complex1.html#K17">|.</a><span class="default"><span class="p2">(<span class="default"><font color="Maroon">a</font> <a href="xcmplx_0.html#K3">*</a> <span class="p3"><a href="arytm_0.html#K5">[*</a><span class="default"><font color="Maroon">r</font>,0</span><a href="arytm_0.html#K5">*]</a></span></span>)</span></span><a href="complex1.html#K17">.|</a></span> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> 0
 <b>by </b><i>, <a class="ref" href="complex2.html#T4" target="_self">Th4</a>, <a class="ref" href="xcmplx_1.html#T6">XCMPLX_1:6</a></i>;<br/><a NAME="E9:28_1_2"/><i><font color="Green">E49</font></i>: 
(  <a href="sin_cos.html#K24">cos</a> <span class="p1">(<span class="default"><a href="comptrig.html#K1">Arg</a> <font color="Maroon">a</font></span>)</span> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><a href="complex1.html#K3">Re</a> <font color="Maroon">a</font></span>)</span> <a href="real_1.html#K6">/</a> <span class="p1"><a href="complex1.html#K17">|.</a><span class="default"><font color="Maroon">a</font></span><a href="complex1.html#K17">.|</a></span> &amp;  <a href="sin_cos.html#K21">sin</a> <span class="p1">(<span class="default"><a href="comptrig.html#K1">Arg</a> <font color="Maroon">a</font></span>)</span> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><a href="complex1.html#K4">Im</a> <font color="Maroon">a</font></span>)</span> <a href="real_1.html#K6">/</a> <span class="p1"><a href="complex1.html#K17">|.</a><span class="default"><font color="Maroon">a</font></span><a href="complex1.html#K17">.|</a></span> )
 <b>by </b><i><a class="txt" href="complex2.html#E2:28_1_2"><i><font color="Green">E29</font></i></a>, <a class="txt" href="complex2.html#E1:28_1_2"><i><font color="Green">E26</font></i></a></i>;<br/><i><font color="Green">E50</font></i>:  <a href="sin_cos.html#K24">cos</a> <span class="p1">(<span class="default"><a href="comptrig.html#K1">Arg</a> <span class="p2">(<span class="default"><font color="Maroon">a</font> <a href="xcmplx_0.html#K3">*</a> <span class="p3"><a href="arytm_0.html#K5">[*</a><span class="default"><font color="Maroon">r</font>,0</span><a href="arytm_0.html#K5">*]</a></span></span>)</span></span>)</span> = 
<span class="p1">(<span class="default"><a href="complex1.html#K3">Re</a> <span class="p2">(<span class="default"><font color="Maroon">a</font> <a href="xcmplx_0.html#K3">*</a> <span class="p3"><a href="arytm_0.html#K5">[*</a><span class="default"><font color="Maroon">r</font>,0</span><a href="arytm_0.html#K5">*]</a></span></span>)</span></span>)</span> <a href="real_1.html#K6">/</a> <span class="p1"><a href="complex1.html#K17">|.</a><span class="default"><span class="p2">(<span class="default"><font color="Maroon">a</font> <a href="xcmplx_0.html#K3">*</a> <span class="p3"><a href="arytm_0.html#K5">[*</a><span class="default"><font color="Maroon">r</font>,0</span><a href="arytm_0.html#K5">*]</a></span></span>)</span></span><a href="complex1.html#K17">.|</a></span>
<b>by </b><i>, <a class="txt" href="complex2.html#E1:28_1_2"><i><font color="Green">E26</font></i></a>, <a class="ref" href="complex1.html#T130">COMPLEX1:130</a></i>
<br/>.= 
 <a href="sin_cos.html#K24">cos</a> <span class="p1">(<span class="default"><a href="comptrig.html#K1">Arg</a> <font color="Maroon">a</font></span>)</span>
<b>by </b><i>, <a class="txt" href="complex2.html#E5:28_1_2"><i><font color="Green">E32</font></i></a>, <a class="ref" href="complex2.html#T4" target="_self">Th4</a>, , <a class="ref" href="xcmplx_1.html#T92">XCMPLX_1:92</a></i>
;<br/><i><font color="Green">E51</font></i>:  <a href="sin_cos.html#K21">sin</a> <span class="p1">(<span class="default"><a href="comptrig.html#K1">Arg</a> <span class="p2">(<span class="default"><font color="Maroon">a</font> <a href="xcmplx_0.html#K3">*</a> <span class="p3"><a href="arytm_0.html#K5">[*</a><span class="default"><font color="Maroon">r</font>,0</span><a href="arytm_0.html#K5">*]</a></span></span>)</span></span>)</span> = 
<span class="p1">(<span class="default"><a href="complex1.html#K4">Im</a> <span class="p2">(<span class="default"><font color="Maroon">a</font> <a href="xcmplx_0.html#K3">*</a> <span class="p3"><a href="arytm_0.html#K5">[*</a><span class="default"><font color="Maroon">r</font>,0</span><a href="arytm_0.html#K5">*]</a></span></span>)</span></span>)</span> <a href="real_1.html#K6">/</a> <span class="p1"><a href="complex1.html#K17">|.</a><span class="default"><span class="p2">(<span class="default"><font color="Maroon">a</font> <a href="xcmplx_0.html#K3">*</a> <span class="p3"><a href="arytm_0.html#K5">[*</a><span class="default"><font color="Maroon">r</font>,0</span><a href="arytm_0.html#K5">*]</a></span></span>)</span></span><a href="complex1.html#K17">.|</a></span>
<b>by </b><i>, <a class="txt" href="complex2.html#E1:28_1_2"><i><font color="Green">E26</font></i></a>, <a class="ref" href="complex1.html#T130">COMPLEX1:130</a></i>
<br/>.= 
 <a href="sin_cos.html#K21">sin</a> <span class="p1">(<span class="default"><a href="comptrig.html#K1">Arg</a> <font color="Maroon">a</font></span>)</span>
<b>by </b><i>, <a class="txt" href="complex2.html#E6:28_1_2"><i><font color="Green">E33</font></i></a>, <a class="ref" href="complex2.html#T4" target="_self">Th4</a>, , <a class="ref" href="xcmplx_1.html#T92">XCMPLX_1:92</a></i>
;<br/><a NAME="E12:28_1_2"/>
( 0 <a href="xxreal_0.html#R1">&lt;=</a>  <a href="comptrig.html#K1">Arg</a> <span class="p1">(<span class="default"><font color="Maroon">a</font> <a href="xcmplx_0.html#K3">*</a> <span class="p2"><a href="arytm_0.html#K5">[*</a><span class="default"><font color="Maroon">r</font>,0</span><a href="arytm_0.html#K5">*]</a></span></span>)</span> &amp;  <a href="comptrig.html#K1">Arg</a> <span class="p1">(<span class="default"><font color="Maroon">a</font> <a href="xcmplx_0.html#K3">*</a> <span class="p2"><a href="arytm_0.html#K5">[*</a><span class="default"><font color="Maroon">r</font>,0</span><a href="arytm_0.html#K5">*]</a></span></span>)</span> <a href="xxreal_0.html#R1">&lt;</a> 2 <a href="real_1.html#K4">*</a> <a href="sin_cos.html#K35">PI</a>  &amp; 0 <a href="xxreal_0.html#R1">&lt;=</a>  <a href="comptrig.html#K1">Arg</a> <font color="Maroon">a</font> &amp;  <a href="comptrig.html#K1">Arg</a> <font color="Maroon">a</font> <a href="xxreal_0.html#R1">&lt;</a> 2 <a href="real_1.html#K4">*</a> <a href="sin_cos.html#K35">PI</a>  )
 <b>by </b><i><a class="ref" href="comptrig.html#T52">COMPTRIG:52</a></i>;<br/><b>hence </b><a NAME="E13:28_1_2"/>
 <a href="comptrig.html#K1">Arg</a> <span class="p1">(<span class="default"><font color="Maroon">a</font> <a href="xcmplx_0.html#K3">*</a> <span class="p2"><a href="arytm_0.html#K5">[*</a><span class="default"><font color="Maroon">r</font>,0</span><a href="arytm_0.html#K5">*]</a></span></span>)</span> <a href="hidden.html#R1">=</a>  <a href="comptrig.html#K1">Arg</a> <font color="Maroon">a</font>
 <b>by </b><i>, <a class="ref" href="complex2.html#T6" target="_self">Th6</a>, </i>;<br/></div><b>end;</b></div></div><b>end;</b></div>

</div>
