May 15th, 2016, 07:23 PM  #81 
Senior Member Joined: Nov 2010 From: Indonesia Posts: 2,000 Thanks: 132 Math Focus: Trigonometry 
How to write vectors and matrices in LaTeX, as well as the Sarrus method in which we make diagonal slashes (not \cancel)?

May 15th, 2016, 08:39 PM  #82 
Math Team Joined: Dec 2013 From: Colombia Posts: 7,446 Thanks: 2499 Math Focus: Mainly analysis and algebra 
$$\begin{bmatrix} a_{11} & a_{12} & \cdots & a_{1n} \\ a_{21} & a_{22} & \cdots & a_{2n} \\ \vdots & \vdots & \ddots & \vdots \\ a_{n1} & a_{n2} & \cdots & a_{nn} \\ \end{bmatrix}$$ You can also use $$\begin{Bmatrix} a & b \\ c & d \end{Bmatrix}$$ Or $$\begin{pmatrix} a & b \\ c & d \end{pmatrix}$$ 

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