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Using the properties of detaminants, powe that \( \begin{array} { l l } { ( y + z ) ^ { 2 } } & { x ^ { 2 } } \\ { y ^ { 2 } } & { ( x + x ) ^ { 2 } } & { y ^ { 2 } } \\ { z ^ { 2 } } & { z ^ { 2 } } & { ( x + y ) ^ { 2 } } \end{array} | = 2 x y z ( x + y + z ) ^ { 3 } \)

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