jee-main 2014 Q89

jee-main · India · 06apr Vectors: Lines & Planes Dihedral Angle or Angle Between Planes/Lines
The angle between the lines whose direction cosines satisfy the equations $l + m + n = 0$ and $l ^ { 2 } = m ^ { 2 } + n ^ { 2 }$ is
(1) $\frac { \pi } { 6 }$
(2) $\frac { \pi } { 2 }$
(3) $\frac { \pi } { 3 }$
(4) $\frac { \pi } { 4 }$ 
The angle between the lines whose direction cosines satisfy the equations $l + m + n = 0$ and $l ^ { 2 } = m ^ { 2 } + n ^ { 2 }$ is\\
(1) $\frac { \pi } { 6 }$\\
(2) $\frac { \pi } { 2 }$\\
(3) $\frac { \pi } { 3 }$\\
(4) $\frac { \pi } { 4 }$
Paper Questions
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