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\begin{equation}
D =x_3\left|\begin{array}{cc}
y_3-y_1 & z_1-z_3\\
y_3-y_2 & z_2-z_3  
\end{array}\right|
+y_3\left|\begin{array}{cc}
x_3-x_1 & z_1-z_3\\
x_3-x_2 & z_2-z-3  
\end{array}\right|\\
+z_3\left|\begin{array}{cc}
x_3-x_1 & y_1-y_3\\
x_3-x_2 & y_2-y-3  
\end{array}\right|
\end{equation}
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