Code:
$ z=\frac{\left|\begin{matrix}a_{1}&b_{1}&k_{1}\\a_{2}&b_{2}&k_{2}\\a_{3}&b_{3}&k_{3}\end{matrix}\right|}{\Delta} $
Code:
$ z=\frac{\left|\begin{matrix}a_{1}&b_{1}&k_{1}\\a_{2}&b_{2}&k_{2}\\a_{3}&b_{3}&k_{3}\end{matrix}\right|}{\Delta} $
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