Test Academy | The direction cosines of any normal to the xy plane are 1, 0 ,0, 0, 1, 0, 1, 1, 0, 0, 0, 1

Question

The direction cosines of any normal to the xy plane are

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1, 0 ,0
0, 1, 0
1, 1, 0
0, 0, 1

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