3-d

Question: If direction ratios of two lines are $5,\,\,-12,\,13$ and $-3,\,4,\,5$ then the angle between them is

1) ${{\cos }^{-1}}(1/65)$

2) ${{\cos }^{-1}}(2/65)$

3) ${{\cos }^{-1}}(3/65)$

4) $\pi /2$

Solution:

Explanation: No Explanation

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