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A line makes equal acute angles with all three axes. Each of its direction cosines is:
A1/√2
B1/3
C√3
D1/√3
Answer & Solution
Correct answer: D. 1/√3
With l = m = n, the relation l² + m² + n² = 1 gives 3l² = 1, so l = 1/√3.
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