lass="special">=</span> <span class="special">(</span><span class="number">1</span><span class="special">-</span><span class="identifier">v</span><span class="special">*</span><span class="identifier">cotv</span><span class="special">)*(</span><span class="number">1</span><span class="special">-</span><span class="identifier">v</span><span class="special">*</span><span class="identifier">cotv</span><span class="special">)</span> <span class="special">+</span> <span class="identifier">v</span><span class="sp