If the direction cosines $l, m, n$ of two lines are satisfying the relations $l+m+n=0$, $l m=0$, then the…

If the direction cosines $l, m, n$ of two lines are satisfying the relations $l+m+n=0$, $l m=0$, then the angle between those two lines is
  1. $0$
  2. $\frac{\pi}{2}$
  3. $\frac{\pi}{4}$
  4. $\frac{\pi}{3}$

Solution

No solution. Refer to answer key.

Asked in: AP EAMCET 2017 (25 Apr Shift 2)

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