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If $\mathrm{A}$ is an identity matrix of order 3 , then its inverse $\left(\mathrm{A}^{-1}\right)$
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is equal to $\mathrm{A}$
Given, A is an identity matrix. $\therefore \mathrm{A}=\mathrm{I}$
We know, $\mathrm{I}^{-1}=\mathrm{I}$
$\therefore \mathrm{A}^{-1}=\mathrm{A}$
We know, $\mathrm{I}^{-1}=\mathrm{I}$
$\therefore \mathrm{A}^{-1}=\mathrm{A}$
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