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A line is equally inclined to all three coordinate axes. Its direction cosines are
A±1/2 each
B±1/3 each
C±1/√3 each
D±√3 each
Answer & Solution
Correct answer: C. ±1/√3 each
Equal angles give l = m = n, and 3l² = 1 gives l = ±1/√3.
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