ecial">*</span> <span class="identifier">a2</span> <span class="special">*</span> <span class="identifier">Ek</span><span class="special">)</span> <span class="special">/</span> <span class="special">(</span><span class="identifier">a</span> <span class="special">*</span> <span class="special">(</span><span class="identifier">a2</span> <span class="special">-</span> <span class="identifier">b2</span><span class="special">)</span> <span class="special">*</span> <span class="special">(</span><span class="iden