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  4. If A=[a b c d], then determinant of A is written as

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Q. If $A=\begin{bmatrix}a & b \\ c & d\end{bmatrix}$, then determinant of $A$ is written as

Determinants

Solution:

If $A=\begin{bmatrix}a & b \\ c & d\end{bmatrix}$, then determinant of $A$ is written as
$|A|=\begin{vmatrix} a & b \\ c & d \end{vmatrix}=\text{det}(A)$