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What are the materials that remain uncha...

What are the materials that remain unchanged over long periods of time?

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The materials that remain unchanged over long periods of time are empty medicine bottles, bubble packs, milk packets, broken plastic footwear.
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Verify: The value of the determinant remains unchanged if its rows and columns are interchanged. Delta=|{:(2,-3,5),(6,0,4),(1,5,-7):}|