Mathematics · 2021
JEE Main · 27 August 2021, Shift 2 · Q76
The angle between the straight lines, whose direction cosines are given by the equations 2 l+2 m - n =0 and mn + n l+l m =0, is:
The angle between the straight lines, whose direction cosines are given by the equations $\displaystyle 2 l+2 \mathrm{~m}-\mathrm{n}=0$ and $\displaystyle \mathrm{mn}+\mathrm{n} l+l \mathrm{~m}=0$, is :
Official answer
(3)
$\displaystyle \frac{\pi}{2}$
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JEE Main 2021 Mathematics question, with the answer from NTA’s final answer key. Where our answers come from.