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If P(-1,2) and Q(3,-7) are two points, e...

If `P(-1,2) and Q(3,-7)` are two points, express the vectors `vec(PQ)` in terms of unit vectors `hatiand hatj`. Also find the distance between points P and Q. What is the unit vector in the direction of `vec(PQ)`? Verify that magnitude of unit vector indeed unity.

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