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| 1. |
\left. \begin{array} { l } { \text { simplity the folloning. } } \\ { ( a ^ { 2 } + b ^ { 2 } ) ( a ^ { 2 } + b ^ { 2 } ) - ( a ^ { 2 } b ^ { 2 } ) ( a ^ { 2 } b ^ { 2 } ) } \end{array} \right. |
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