al">;</span>
      <span class="identifier">T</span> <span class="identifier">dfx</span> <span class="special">=</span> <span class="number">4</span> <span class="special">*</span> <span class="special">(</span><span class="identifier">a2</span> <span class="special">*</span> <span class="identifier">Ek</span> <span class="special">-</span> <span class="identifier">b2</span> <span class="special">*</span> <span class="identifier">Kk</span><span class="special">)</span> <span class="special">/</span> <span c