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| 1. |
\begin{array}{l}{\text { Compute the following: }} \\ {\text { (i) } \left[ \begin{array}{cc}{a} & {b} \\ {-b} & {a}\end{array}\right]+\left[ \begin{array}{ll}{a} & {b} \\ {b} & {a}\end{array}\right]}\end{array} |
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