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Find a unit vector u in the direction opposite of ⟨−3,−9,−9⟩.

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  1. go east instead of west
    go north instead of south
    go up instead of down
    so unit vector in direction of (3 , 9 , 9 )
    sqrt(9+2*81) = sqrt171
    so
    (3/sqrt171 , 9/sqrt171 , 9/sqrt171)

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