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P,Q,R,S are points hati-hatj-hatk, -hati...

P,Q,R,S are points `hati-hatj-hatk, -hati+hatj, 2hati-3hatk and 3hati-2hatj-hatk` respectivley. Show that the projectionof PQ on RS is equal to that of RS on PQ each being `-4/3`. Also find the cosine of their inclination.

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