A matriz
!$ B=\begin{bmatrix} 0 & 0 & 1 & 0 \\ sen\, \theta & 1 & 0 & 0 \\ sen\, \theta & \cos \theta & 0 & 0 \\ sen\, \theta & \cos \theta & 0 & 1\end{bmatrix} !$
admite inversa B -1, se, e somente se
!$ B=\begin{bmatrix} 0 & 0 & 1 & 0 \\ sen\, \theta & 1 & 0 & 0 \\ sen\, \theta & \cos \theta & 0 & 0 \\ sen\, \theta & \cos \theta & 0 & 1\end{bmatrix} !$
