If \( A=\left[\begin{array}{cc}\cos \theta & -\sin \theta \\ \sin \...

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If \( A=\left[\begin{array}{cc}\cos \theta & -\sin \theta \\ \sin \theta & \cos \theta\end{array}\right] \), then \( A^{T}+A=I_{2} \), if
\( \mathrm{P} \)
W
(A) \( \theta=n \pi, n \in Z \)
(B) \( \theta=(2 n+1) \pi / 2, n \in Z \)
(C) \( \theta=2 n \pi+\pi / 3, n \in Z \)
(D) None of these
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