Given that find: (a) |P + Q R|, (b) P Q X R, (c) Q

Question:

Given that

find: 

(a) |P + Q –  R|, 

(b) P ∙ Q X R, 

(c) Q X P ∙ R, 

(d) (P X Q) ∙ (Q X R),
(e) (P X Q) X (Q X R), 

(f) cos θPR

(g) sin θPQ.

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