<div class="para">A sentence ending in a period</div>
<div class="displaymath process-math" id="md-1">
  \begin{align}
  \frac{d}{dx}\definiteintegral{a}{x}{f(t)}{t}&#x26;=\frac{d}{dx}\left(F(x)-F(a)\right)\notag\\
  &#x26;=\frac{d}{dx}F(x)-\frac{d}{dx}F(a)\tag{1}\\ &#x26;=f(x)-0 =
  f(x)\text{.}\notag \end{align}
</div>
