TeX джерело:

A_{13}\,=\,\left|\begin{array}{rr}1&-3\\3&-4\end{array}\right|=5,\;\; A_{23}\,=\,-\,\left|\begin{array}{rr}2&0\\3&4\end{array}\right|=8,\;\; A_{33}\,=\,\left|\begin{array}{rr}2&0\\1&-3\end{array}\right|=-6,\;\;