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Question - Direction Cosines and Direction Ratios of a Line

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Question

Direction cosines of the line passing through the points A (- 4, 2, 3) and B (1, 3, -2) are.........

(a) `+-1/sqrt51,+-5/sqrt51,+-1/sqrt51`

(b) `+-5/sqrt51,+-5/sqrt51,+-5/sqrt51`

(c) `+-sqrt5,+-1,+-5`

(d) `+-sqrt51,+-sqrt51+-sqrt51`

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