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The vectors AB = 3i - 2j + 2k and BC = -...

The vectors AB = 3i - 2j + 2k and BC = - I - 2k are the adjacent sides of a parallelogram. The angle between its diagonals is

A

`pi/2`

B

`pi/3 or (2pi)/(3)`

C

`(3pi)/(4) or (pi)/4`

D

None of these

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The correct Answer is:
C
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