A square matrix \( A \) is called involutory if \( A^{2} \) is equa...

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A square matrix \( A \) is called involutory if \( A^{2} \) is equal
\( \mathrm{P} \)
to
W
(1) \( A \)
(2) \( I \)
(3) \( A^{3} \)
(4) \( A^{4} \)
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