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| 1. |
\left[ \begin{array}{cc}{a} & {b} \\ {-b} & {a}\end{array}\right] \left[ \begin{array}{cc}{a} & {-b} \\ {b} & {a}\end{array}\right] \text { (a) } \left[ \begin{array}{l}{1} \\ {2} \\ {3}\end{array}\right] \left[ \begin{array}{lll}{2} & {3} & {4}\end{array}\right] |
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