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If two vectors OA and OB are there, then...

If two vectors OA and OB are there, then their resultant OA+OB can be found by completin the parallelogram OACB and OC=OA+OB. Also, if |OA|=|OB|, then the resultant will bisect the angle between them.
Q. A vector C directed along internal bisector of angle between vectors `A=7hati-4hatj-4hatk and B=-2hati-hatj+2hatk` with `|C|=5sqrt(6)` is

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