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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Lekhika
see the attachment. But there is one correction in q. that v= a n+ b i(not j)
can u please tell how underroot thing came up!
if u're asking of sqrt in |u|, then it's by defination of dot product., i.e, dot product of vector by itself equals to its magnitude square. so u can find magnitude by taking sqrt of dot product term.