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For ratios 1, -2, -2, the direction cosines with positive first entry are
A1/3, 2/3, 2/3
B1/3, -2/3, -2/3
C-1/3, -2/3, -2/3
D1/5, -2/5, -2/5
Answer & Solution
Correct answer: B. 1/3, -2/3, -2/3
The root of 1 + 4 + 4 is 3, so the cosines are 1/3, -2/3, -2/3.
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