If A, B, C and D are the points with pos...

If A, B, C and D are the points with position vectors `hati-hatj+hatk,2hati-hatj+3hatk,2hati-3hatkand3hati-2hatj+hatk` respectively, then find the projection of `vec(AB)andvec(CD)`.

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`sqrt(21)` units

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