\begin{equation*}
  \sum_{i=1}^{n^2}(x+2)
\end{equation*}
\begin{equation*}
  \prod_{j=1}^{100}(3 \cdot x)
\end{equation*}
\begin{equation*}
  \lim_{x \rightarrow \infty}(14x^3 - 12)
\end{equation*}
\begin{equation*}
  \int\limits_{-12}^{4}(14x^3 - 12)
\end{equation*}