যদি $A X=\left[\begin{array}{cc}0 & 1 \\-1 & 0\end{array}\right]$ $\left[\begin{array}{l}x \\y\end{array}\right]=$ $\left[\begin{array}{c}y \\-x\end{array}\right]$ হয় তাবে $X A^{2}$ হবে-

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