Mathematics · 2018
JEE Main · 15 April 2018, Shift 2 · Q83
An angle between the lines whose direction cosines are given by the equations, l+3 m +5 n =0 and 5 l m-2 m n+6 n l=0, is:
An angle between the lines whose direction cosines are given by the equations, $\displaystyle l+3 \mathrm{~m}+5 \mathrm{n}=0$ and $\displaystyle 5 l m-2 m n+6 n l=0$, is :
Official answer
(3)
$\displaystyle \cos ^{-1}\left(\frac{1}{6}\right)$
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JEE Main 2018 Mathematics question, with the answer from NTA’s final answer key. Where our answers come from.