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જો $A=\left(\begin{array}{cc}0 & \sin \alpha \\ \sin \alpha & 0\end{array}\right)$ અને $\operatorname{det}\left(A^{2}-\frac{1}{2} I\right)=0,$ હોય તો $\alpha$ ની શક્ય કિમંત મેળવો.