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Let bar(a)= 4bar(i) + 2bar(j) + 5 bar(k)...

Let `bar(a)= 4bar(i) + 2bar(j) + 5 bar(k), bar(b)= 3 bar(i) +3 bar(j)`. Find the unit vector in the direction of `bar(a) + bar(b)`.

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