JEE Math Practice Question
The angle between the lines whose direction cosines satisfy the equations $$l+m+n=0$$ and $${l^2} = {m^2} + {n^2}$$ is :
- A.$${\pi \over 6}$$
- B.$${\pi \over 2}$$
- C.$${\pi \over 3}$$
- D.$${\pi \over 4}$$
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