Let $\quad \mathrm{A}=\left(\begin{array}{cc}\cos \alpha & -\sin \alpha \\ \sin \alpha & \cos \alpha\end{array}\right),(\alpha \in \mathrm{R}) \quad$ such that $A^{32}=\left(\begin{array}{rr}0 & -1 \\ 1 & 0\end{array}\right)$. Then a value of $\alpha$ is :
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