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If \( F(x)=\left[\begin{array}{ccc}\cos x & -\sin x & 0 \\ \sin x & \cos x & 0 \\ 0 & 0 & 1\end{array}\right] \) and \( G(y)=\left[\begin{array}{ccc}\cos y & 0 & \sin y \\ 0 & 1 & 0 \\ -\sin y & 0 & \cos y\end{array}\right] \), then \( [F(x) G(y)]^{-1} \) is equal to
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