The angle between the straight lines whose direction cosines... | 3D Geometry

JEE MAIN_2021_

27-8-2021_S2

Question

The angle between the straight lines, whose direction cosines are given by the equations $2 \ell+2 \mathrm{~m}-\mathrm{n}=0$ and $\mathrm{mn}+\mathrm{n} \ell+\ell \mathrm{m}=0$, is:

Select the correct option:

$\frac{\pi}{2}$

$\pi-\cos ^{-1}\left(\frac{4}{9}\right)$

$\cos ^{-1}\left(\frac{8}{9}\right)$

$\frac{\pi}{3}$

✓ Correct! Well done.

✗ Incorrect. Try again or view the solution.

Solution

Question Tags

JEE Main

Mathematics

Easy

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