Mathematics · 2026
JEE Main · 23 January 2026, Shift 1 · Q16
Let the direction cosines of two lines satisfy the equations: 4 l+ m - n =0 and 2 mn +10 n l+3 l m =0. Then the cosine of the acute angle between…
Let the direction cosines of two lines satisfy the equations : $\displaystyle 4 l+\mathrm{m}-\mathrm{n}=0$ and $\displaystyle 2 \mathrm{mn}+10 \mathrm{n} l+3 l \mathrm{~m}=0$. Then the cosine of the acute angle between these lines is :
Official answer
From NTA’s final answer key for this paper.
(2)
$\displaystyle \frac{10}{3 \sqrt{38}}$
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JEE Main 2026 Mathematics question, with the answer from NTA’s final answer key. Where our answers come from.