Question

If vector R= P+Q and R= P+Q​

Answer 1

Explanation:

When, P+Q=R or P−R=−Q

(P−R).(P−R)=(−Q).(−Q)

P2+R2−2PRcosθ1=Q2

cosθ1=1/2  (as P=Q=R)

θ1=600

When, P+Q+R=0 or P+R=−Q

(P+R).(P+R)=(−

Answer 2

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