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I am working on MathJax.

$
\begin{array}{|ccc|cc}
1 & 2 &4 & 1 &2\\
3& 1 & 2 & 3 & 1\\
2 & 4 & 0 & 2 & 4\\
\end{array} = (0 + 8 + 48) - ( 8 + 8 + 0) = 40
$

Question :

I want crossing lines to show how to calculate the determinant of my matrix. I do not know how to call it in English.

Could somebody give me a hint or sample please?

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    Welcome! I'm afraid that questions about MathJax are off-topic here as MathJax does not actually have anything to do with TeX but only implements a subset of LaTeX syntax in a completely independent way.
    – cfr
    Jan 21 '16 at 2:45
  • Oh! sorry sorry. I did not know about deep details before. Thank you for your reply.
    – Sarit
    Jan 21 '16 at 2:47
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    No problem. The fact that the site has a mathjax tag shows you just how common it is to ask questions about it here! (And obviously the existence of the tag can't help but suggest that it is on-topic. So there's a kind of cycle, I think.)
    – cfr
    Jan 21 '16 at 2:50

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