How can I add cross line in determinant?

[ABIR HASAN ZOHA]

I am working with Mathjax. How can I make the determinant looks like the picture I have attached.

$ \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 $

[Peter Krautzberger]

Hi Abir,

I'm afraid that's not possible with MathJax at this time. 

MathJax's internal format is (essentially) MathML which cannot produce this overlapping strike-through layout. Realizing this in HTML/CSS would be somewhat difficult I think, see e.g., http://jsbin.com/oqibus/1/edit?html,css,output for a related use case.

Regards,

Peter.

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[Davide Cervone]

Peter is right that there is no natural way to do it, but there is a hack that can be used to get what you want:

$$

\require{enclose}
\def\ddown{\smash{\rlap{\!\enclose{downdiagonalstrike}{\Space{3.2em}{.5em}{2.7em}}}}}
\def\dup{\smash{\rlap{\!\enclose{updiagonalstrike}{\Space{3.2em}{.5em}{2.7em}}}}}
\begin{array}{|ccc|cc} 

\ddown\dup 1 & \ddown\dup 2 &\ddown\dup 4 & 1 &2\\ 

3& 1 & 2 & 3 & 1\\
 2 & 4 & 0 & 2 & 4\
 \end{array} = (0 + 8 + 48) - ( 8 + 8 + 0) = 40

$$

This uses the "enclose" extension to produce diagonal lines, and the \Space macro to produce a blank area of the desired size for the diagonal.  It's not great, but it works.

Davide

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