MCQ
If $\mathrm{A}=\left[\begin{array}{ll}\cos \alpha & -\sin \alpha \\ \sin \alpha & \cos \alpha\end{array}\right]$ then $\mathrm{A}^{-1}=\ldots$
- A$\left[\begin{array}{rr}1 / \cos \alpha & -1 / \sin \alpha \\ 1 / \sin \alpha & 1 / \cos \alpha\end{array}\right]$
- ✓$\left[\begin{array}{rr}\cos \alpha & -\sin \alpha \\ -\sin \alpha & \cos \alpha\end{array}\right]$
- C$\left[\begin{array}{ll}-\cos \alpha & \sin \alpha \\ -\sin \alpha & \cos \alpha\end{array}\right]$
- D$\left[\begin{array}{rr}-\cos \alpha & \sin \alpha \\ \sin \alpha & -\cos \alpha\end{array}\right]$