$$A = \left[ \begin{array} { l l } { \cos \theta } & { \sin \theta } \\ { - \sin \theta } & { \cos \theta } \\ { 0 } & { 0 } & { 1 } \end{array} \right]$$
$A≔\left(\begin{matrix}\cos(\theta )&\sin(\theta )&0\\-\sin(\theta )&\cos(\theta )&0\\0&0&1\end{matrix}\right)$
