Let $A \in \mathbb{R}^{2 \times 2}$ be a D6160: Real square matrix such that

(i)	\begin{equation} A = \begin{bmatrix} a & b \\ c & d \end{bmatrix} \end{equation}

Then \begin{equation} \text{Cof} A = \begin{bmatrix} d & - c \\ - b & a \end{bmatrix} \end{equation}