lass="n">i</span><span class="p">)</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">X</span><span class="p">(</span><span class="n">i</span><span class="p">)</span><span class="o">*</span><span class="nb">COS</span><span class="p">(</span><span class="mf">6.2831853_wp</span><span class="o">*</span><span class="n">F</span><span class="o">*</span><span class="n">ai</span><span class="p">)</span>
<span class="w">            </span><span class="n">Y2</span><span clas