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det(\left(\begin{matrix}2&3\\5&4\end{matrix}\right))
Find determinanten for matrixen.
2\times 4-3\times 5
For den 2\times 2 matrix \left(\begin{matrix}a&b\\c&d\end{matrix}\right) er determinanten ad-bc.
8-3\times 5
Multiplicer 2 gange 4.
8-15
Multiplicer 3 gange 5.
-7
Subtraher 15 fra 8.