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A line has direction cosines (1/3, 2/3, 2/3) and another has (2/3, 1/3, -2/3). The angle between them is:
A45 degrees
B60 degrees
C90 degrees
D0 degrees
Answer & Solution
Correct answer: C. 90 degrees
The sum of products is 2/9 + 2/9 - 4/9 = 0, so cos theta = 0.
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