A plane contains the vectors A and B. Determine the unit vector normal to the plane when
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A plane contains the vectors A and B. Determine the unit vector normal to the plane when A and B are equal to, respectively,
(a) 4i − 2j + 3k and −2i + 6j − 5k,
(b) 7i + j − 4k and −6i − 3k + 2k.
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