efined by:
      </p>
<p>
        <span class="inlinemediaobject"><img src="../../../equations/fraction4.svg"></span>
      </p>
<p>
        So its generator object would look like:
      </p>
<pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">tan_fraction</span>
<span class="special">{</span>
<span 