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If is the angle between the vectors 4( i - k ) and i + j + k , then what is ( + ) equal to?

Options

  1. A0
  2. B1 2
  3. C1
  4. D2

Correct answer

C. 1

Step-by-step solution

aligned & =4( i - k ) ( i + j + k )=0 & = 2 & + =1 aligned

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