3-d

Question: The angle between a line with direction ratios 2 : 2 : 1 and a line joining (3, 1, 4) to (7, 2, 12) is

1) ${{\cos }^{-1}}(2/3)$

2) ${{\cos }^{-1}}(-2/3)$

3) ${{\tan }^{-1}}(2/3)$

4) None of these

Solution:

Explanation: No Explanation

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