Mathematics · 2013
JEE Main · 22 April 2013, Shift 1 · Q81
The acute angle between two lines such that the direction cosines l, m, n, of each of them satisfy the equations l + m + n =0 and l^2+ m^2- n^2=0 is:
The acute angle between two lines such that the direction cosines $\displaystyle \mathrm{l}, \mathrm{m}, \mathrm{n}$, of each of them satisfy the equations $\displaystyle \mathrm{l}+\mathrm{m}+\mathrm{n}=0$ and $\displaystyle \mathrm{l}^2+\mathrm{m}^2-\mathrm{n}^2=0$ is :
Official answer
(3)
$\displaystyle 60$°
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JEE Main 2013 Mathematics question, with the answer from NTA’s final answer key. Where our answers come from.