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If A =[[l(1),m(1),n(1)],[l(2),m(2),n(2)]...

If A =`[[l_(1),m_(1),n_(1)],[l_(2),m_(2),n_(2)],[l_(3),m_(3),n_(3)]]` then Find `A+I`

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To find \( A + I \), where \( A \) is given as \[ A = \begin{bmatrix} l_1 & m_1 & n_1 \\ l_2 & m_2 & n_2 \\ l_3 & m_3 & n_3 \end{bmatrix} ...
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