Question: Let a = ( - 2 , 2 , 1 ) , b = ( - 2 , 0 , 1 ) , c =

Let a=(-2,2,1),b=(-2,0,1),c=(0,1,-3),d=(,1-3,-), and e=(1,-2,-) be any five vectors in R3.
Find if d is a unit vector.

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