If for the matrix \( A=\left[\begin{array}{cc}\cos \theta & 2 \...

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If for the matrix \( A=\left[\begin{array}{cc}\cos \theta & 2 \sin \theta \\ \sin \theta & \cos \theta\end{array}\right], A^{-1}=A^{T} \) then number of possible value(s) of \( \theta \) in \( [0,2 \pi] \) is:
 
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