The angle between the lines whose direction cosines satisfy the equations

Question:

The angle between the lines whose direction cosines satisfy the equations $\ell+\mathrm{m}+\mathrm{n}=0$ and $\ell^{2}=\mathrm{m}^{2}+\mathrm{n}^{2}$ is :

  1. $\frac{\pi}{3}$

  2. $\frac{\pi}{4}$

  3. $\frac{\pi}{6}$

  4. $\frac{\pi}{2}$


Correct Option: 1

Solution:

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