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| 1. |
\left. \begin{array} { l } { t ^ { 2 } - ( \alpha + \beta ) t + ( \alpha + \beta ) ( \alpha - \beta ) = 0 } \\ { t ^ { 2 } + 2 \alpha t + \alpha ^ { 2 } + \beta ^ { 2 } = 0 } \\ { t ^ { 2 } - 2 \alpha t + \alpha ^ { 2 } - \beta ^ { 2 } = 0 } \\ { t ^ { 2 } + 2 \alpha t + 2 \beta = 0 } \end{array} \right. |
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