Home › TS EAMCET › Mathematics › Coordinate Geometry: Direction Cosines and Direction Ratios › Reversing a line with cosines 1/3, 2/3, 2/3 gives:
Reversing a line with cosines 1/3, 2/3, 2/3 gives:
A-1/3, -2/3, -2/3
B1/3, 2/3, -2/3
C-1/3, 2/3, 2/3
D2/3, 2/3, 1/3
Answer & Solution
Correct answer: A. -1/3, -2/3, -2/3
Reversing direction replaces each angle by its supplement, so every cosine changes sign.
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