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Which one of the following vectors is normal to the vector kˆ+ jˆ +iˆ

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If | a | = sqrt2 , | b | = sqrt(3)
and | a + b | = sqrt(6)
, then what is | a- b | equal to If θ is the angle between the vectors 4(i-k) and kˆ+ jˆ+ iˆ , then what is (sin θ + cos θ) equal to