Same Variable Matrices in Matrix Thereom

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The Same Variable Matrices in Matrix Thereom states that:


$\begin{bmatrix} \begin{bmatrix} a & c\\ b & d \end{bmatrix} & \begin{bmatrix} c & a\\ b & d \end{bmatrix}\\ \begin{bmatrix} a & c\\ d & b \end{bmatrix} & \begin{bmatrix} c & a\\ d & b \end{bmatrix} \end{bmatrix} = 4abcd - {ab}^2 - {bc}^2 - {cd}^2 - {ad}^2$