Question:
If $A=\left(\begin{array}{cc}\cos \theta & -\sin \theta \\ \sin \theta & \cos \theta\end{array}\right)$ then $A^{-1}=?$
A. A
B. $-\mathrm{A}$
C. Adj $A$
D. $-\operatorname{adj} \mathrm{A}$
Solution:
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