If \( A=\left[\begin{array}{cc}a b & b^{2} \\ -a^{2} & -a b\end{array}\right] \), then \( A \) i...
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0If \( A=\left[\begin{array}{cc}a b & b^{2} \\ -a^{2} & -a b\end{array}\right] \), then \( A \) is
(A) Idempotent
(B) rifipotent
(C) involutory
(D) scalar
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