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If A,B,C,D are the points with positon v...

If A,B,C,D are the points with positon vectors `hat(i)+hatj-hatk,2hati-hatj+3hatk,2hati-3hatk,3hati-2hatj+htk`, respectively find the projection of `vec(AB)` along `vec(CD)`.

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The correct Answer is:
`sqrt(21)` units
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