Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$=|\begin{matrix}1&2&3\\ 2&1&3\\ 1&3&1\end{matrix}|$$

Evaluate

$\left(|l|\right)^{3}$

Differentiate w.r.t. l

$3l|l|$

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