span><span class="mf">2.0</span> <span class="o">+</span> <span class="n">b</span><span class="o">**</span><span class="mf">2.0</span><span class="p">)</span><span class="o">**</span><span class="mf">0.5</span>
                <span class="n">s</span> <span class="o">=</span> <span class="p">(((</span><span class="mf">1.0</span> <span class="o">/</span> <span class="n">W</span><span class="p">)</span> <span class="o">-</span> <span class="mf">1.0</span><span class="p">)</span><span class="o">/</span><span c