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

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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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