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<pre>
<pre>
+
\tableofcontents
+
\subsection{Taylor Series Expansion}
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+
\begin{center}\begin{tabular}{|c|c|c||c|c|c|c|}
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\multicolumn{7}{c}{\textbf{Taylor Series Expansion $\operatorname{D}f = \operatorname{d}f + \operatorname{d}^2 f$}} \\
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\hline
+
&
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$\begin{matrix}
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\operatorname{d}f = \\
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\partial_x f \cdot \operatorname{d}x\ +\ \partial_y f \cdot \operatorname{d}y \\
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\end{matrix}$
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&
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$\begin{matrix}
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\operatorname{d}^2 f = \\
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\partial_{xy} f \cdot \operatorname{d}x\, \operatorname{d}y \\
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\end{matrix}$
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&
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$\operatorname{d}f|_{x\ y}$ &
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$\operatorname{d}f|_{x\ (y)}$ &
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$\operatorname{d}f|_{(x)\ y}$ &
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$\operatorname{d}f|_{(x)(y)}$ \\
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\hline
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$f_0$ & $0$ & $0$ & $0$ & $0$ & $0$ & $0$ \\
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\hline
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$\begin{matrix}
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f_{1} \\
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f_{2} \\
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f_{4} \\
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f_{8} \\
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\end{matrix}$
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&
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$\begin{matrix}
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(y) & \operatorname{d}x & + & (x) & \operatorname{d}y \\
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y & \operatorname{d}x & + & (x) & \operatorname{d}y \\
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(y) & \operatorname{d}x & + & x & \operatorname{d}y \\
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y & \operatorname{d}x & + & x & \operatorname{d}y \\
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\end{matrix}$
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&
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$\begin{matrix}
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\operatorname{d}x\ \operatorname{d}y \\
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\operatorname{d}x\ \operatorname{d}y \\
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\operatorname{d}x\ \operatorname{d}y \\
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\operatorname{d}x\ \operatorname{d}y \\
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\end{matrix}$
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&
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$\begin{matrix}
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0 \\
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\operatorname{d}x \\
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\operatorname{d}y \\
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\operatorname{d}x + \operatorname{d}y \\
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\end{matrix}$
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&
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$\begin{matrix}
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\operatorname{d}x \\
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0 \\
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\operatorname{d}x + \operatorname{d}y \\
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\operatorname{d}y \\
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\end{matrix}$
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&
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$\begin{matrix}
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\operatorname{d}y \\
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\operatorname{d}x + \operatorname{d}y \\
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0 \\
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\operatorname{d}x \\
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\end{matrix}$
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&
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$\begin{matrix}
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\operatorname{d}x + \operatorname{d}y \\
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\operatorname{d}y \\
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\operatorname{d}x \\
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0 \\
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\end{matrix}$ \\
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\hline
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$\begin{matrix}
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f_{3} \\
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f_{12} \\
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\end{matrix}$
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&
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$\begin{matrix}
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\operatorname{d}x \\
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\operatorname{d}x \\
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\end{matrix}$
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&
+
$\begin{matrix}
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0 \\
+
0 \\
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\end{matrix}$
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&
+
$\begin{matrix}
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\operatorname{d}x \\
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\operatorname{d}x \\
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\end{matrix}$
+
&
+
$\begin{matrix}
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\operatorname{d}x \\
+
\operatorname{d}x \\
+
\end{matrix}$
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&
+
$\begin{matrix}
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\operatorname{d}x \\
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\operatorname{d}x \\
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\end{matrix}$
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&
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$\begin{matrix}
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\operatorname{d}x \\
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\operatorname{d}x \\
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\end{matrix}$ \\
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\hline
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$\begin{matrix}
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f_{6} \\
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f_{9} \\
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\end{matrix}$
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&
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$\begin{matrix}
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\operatorname{d}x + \operatorname{d}y \\
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\operatorname{d}x + \operatorname{d}y \\
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\end{matrix}$
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&
+
$\begin{matrix}
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0 \\
+
0 \\
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\end{matrix}$
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&
+
$\begin{matrix}
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\operatorname{d}x + \operatorname{d}y \\
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\operatorname{d}x + \operatorname{d}y \\
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\end{matrix}$
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&
+
$\begin{matrix}
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\operatorname{d}x + \operatorname{d}y \\
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\operatorname{d}x + \operatorname{d}y \\
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\end{matrix}$
+
&
+
$\begin{matrix}
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\operatorname{d}x + \operatorname{d}y \\
+
\operatorname{d}x + \operatorname{d}y \\
+
\end{matrix}$
+
&
+
$\begin{matrix}
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\operatorname{d}x + \operatorname{d}y \\
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\operatorname{d}x + \operatorname{d}y \\
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\end{matrix}$ \\
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\hline
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$\begin{matrix}
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f_{5} \\
+
f_{10} \\
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\end{matrix}$
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&
+
$\begin{matrix}
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\operatorname{d}y \\
+
\operatorname{d}y \\
+
\end{matrix}$
+
&
+
$\begin{matrix}
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0 \\
+
0 \\
+
\end{matrix}$
+
&
+
$\begin{matrix}
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\operatorname{d}y \\
+
\operatorname{d}y \\
+
\end{matrix}$
+
&
+
$\begin{matrix}
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\operatorname{d}y \\
+
\operatorname{d}y \\
+
\end{matrix}$
+
&
+
$\begin{matrix}
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\operatorname{d}y \\
+
\operatorname{d}y \\
+
\end{matrix}$
+
&
+
$\begin{matrix}
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\operatorname{d}y \\
+
\operatorname{d}y \\
+
\end{matrix}$ \\
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\hline
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$\begin{matrix}
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f_{7} \\
+
f_{11} \\
+
f_{13} \\
+
f_{14} \\
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\end{matrix}$
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&
+
$\begin{matrix}
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y & \operatorname{d}x & + & x & \operatorname{d}y \\
+
(y) & \operatorname{d}x & + & x & \operatorname{d}y \\
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y & \operatorname{d}x & + & (x) & \operatorname{d}y \\
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(y) & \operatorname{d}x & + & (x) & \operatorname{d}y \\
+
\end{matrix}$
+
&
+
$\begin{matrix}
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\operatorname{d}x\ \operatorname{d}y \\
+
\operatorname{d}x\ \operatorname{d}y \\
+
\operatorname{d}x\ \operatorname{d}y \\
+
\operatorname{d}x\ \operatorname{d}y \\
+
\end{matrix}$
+
&
+
$\begin{matrix}
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\operatorname{d}x + \operatorname{d}y \\
+
\operatorname{d}y \\
+
\operatorname{d}x \\
+
0 \\
+
\end{matrix}$
+
&
+
$\begin{matrix}
+
\operatorname{d}y \\
+
\operatorname{d}x + \operatorname{d}y \\
+
0 \\
+
\operatorname{d}x \\
+
\end{matrix}$
+
&
+
$\begin{matrix}
+
\operatorname{d}x \\
+
0 \\
+
\operatorname{d}x + \operatorname{d}y \\
+
\operatorname{d}y \\
+
\end{matrix}$
+
&
+
$\begin{matrix}
+
0 \\
+
\operatorname{d}x \\
+
\operatorname{d}y \\
+
\operatorname{d}x + \operatorname{d}y \\
+
\end{matrix}$ \\
+
\hline
+
$f_{15}$ & $0$ & $0$ & $0$ & $0$ & $0$ & $0$ \\
+
\hline
+
\end{tabular}\end{center}
</pre>
</pre>