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| 1. |
\left. \begin{array} { l l } { ( 1 ) } & { x ^ { 2 } - 2 x - 8 } \\ { ( i v ) } & { 4 u ^ { 2 } + 8 u } & { ( v ) } & { t ^ { 2 } - 15 } \end{array} \right. |
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