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6). If vec P Q=3 hat i+2 hat j- hat k ...

6). If ` vec P Q=3 hat i+2 hat j- hat k` and the coordinates of `P` are `(1,-1,2),` find the coordinates of `Qdot` (7). prove that the points `hati-hatj,4hati-3hatj+hatk,2hati-4hatj+5hatk` are the vertices of a right angled triangle.

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