If \( A(\alpha)=\left[\begin{array}{ll}\cos \alpha & \sin \alpha \\...

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If \( A(\alpha)=\left[\begin{array}{ll}\cos \alpha & \sin \alpha \\ -\sin \alpha & \cos \alpha\end{array}\right] \), then the matrix of
\( \mathrm{P} \)
W.
\( \mathrm{A}^{2}(\alpha) \) is equal to:
(A) \( \mathrm{A}(2 \alpha) \)
(B) \( \mathrm{A}(\alpha) \)
(C) \( \mathrm{A}(3 \alpha) \)
(D) \( \mathrm{A}(4 \alpha) \)
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