[" 42.If "vec a" and "vec b" are unit ve...

[" 42.If "vec a" and "vec b" are unit vectors and "theta" is the "],[" angle between them,then "|a-vec b|=?],[(a)cos(theta/2)quad " (b) "2cos(theta/2)],[" (c) "sin(theta/2)," wres "2sin(theta/2)]

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