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The vectors vec a=3 veco-2 vec j+2 vec ...

The vectors ` vec a=3 veco-2 vec j+2 vec k` and ` vec b=- vec i-2 vec k` are adjacent side of a parallelogram. Then angle between its diagonals is `pi/4` (b) `pi/3` (c) `(3pi)/4` (d) `(2pi)/3`

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