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JEE Main 2014

JEE Main 2014 Mathematics question on Three Dimensional Geometry

The angle between the lines whose direction cosines satisfy the equations l+m+n=0l + m + n = 0 and l2=m2+n2l^2 = m^2 + n^2, is
  1. A.
    π3\dfrac{\pi}{3}
  2. B.
    π4\dfrac{\pi}{4}
  3. C.
    π6\dfrac{\pi}{6}
  4. D.
    π2\dfrac{\pi}{2}
Show answer

Correct option: A

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