Q 1751623524.     The angle between the lines whose direction cosines satisfy the equations` l+m+n=0` and `l^{2}=m^{2}+n^{2}` is

JEE 2014 Mains Paper - 5
A

` \frac{\pi }{3}`

B

` \frac{\pi }{4}`

C

` \frac{\pi }{6}`

D

`\frac{\pi }{2}`

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