If \( \mathrm{A} \) and \( \mathrm{B} \) are two square matrices su...

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If \( \mathrm{A} \) and \( \mathrm{B} \) are two square matrices such that \( \mathrm{B}=-\mathrm{A}^{-1} \mathrm{BA} \), then \( (\mathrm{A}+\mathrm{B})^{2} \) is equal to
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