Titik stationer
\begin{equation*}
f'(x) = 0
\end{equation*}
Jenis titik stationer
\begin{equation*}
\begin{split}
f''(x) & > 0 \quad \text{titik minimum lokal} \\\\
f''(x) & < 0 \quad \text{titik maksimum lokal} \\\\
f''(x) & = 0 \quad \text{titik belok}
\end{split}
\end{equation*}
