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Let A=1i + 1k, B = 1i + 4j +1 k. What is the cosine of the angle between the vectors A and B? 9+

Let A=1i + 1k, B = 1i + 4j +1 k. What is the cosine of the angle between the vectors A and B? 9+ 29 cos (angle between A and B) = . (You may express your answer in terms of square roots. Expressions like are acceptable.) 127+ 12-13

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