If $A=\left[\begin{matrix}\cos \alpha & -\sin \alpha \ \sin \alpha & \cos \alpha \end{matrix}\right]$ and $A+{A}^{'}=I$, then the value of $\alpha$ is

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If \(A=\left[\begin{matrix}\cos \alpha & -\sin \alpha \\ \sin \alpha & \cos \alpha \end{matrix}\right]\) and \(A+{A}^{'}…

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