the solution will be like this let A and B be two vectors then we know that from parllel law A2 + B2 +2ABcosX=R2........................1.1 here A2 means square of A similar to all others now R=A...............1 or R=B....................2 putting 1in 1.1 A2 +B2+2ABcosX=A2 so cosX=-B/2A similarly if R=B then cosX=-A/2B WHAT U THINK?
Moderation Team
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