3-d

Question: If direction cosines of two lines are proportional to (2, 3, –6) and (3, –4, 5), then the acute angle between them is

1) ${{\cos }^{-1}}\left( \frac{49}{36} \right)$

2) ${{\cos }^{-1}}\left( \frac{18\sqrt{2}}{35} \right)$

3) $96{}^\circ $

4) ${{\cos }^{-1}}\left( \frac{18}{35} \right)$

Solution:

Explanation: No Explanation

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