The acute angle between two lines such that the direction cosines \...

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The acute angle between two lines such that the direction cosines \( \ell, \mathrm{m}, \mathrm{n} \) of each of them satisfy the equations \( \ell+\mathrm{m}+\mathrm{n}=0 \) and \( \ell^{2}+\mathrm{m}^{2}-\mathrm{n}^{2}=0 \) is :-
\( \mathrm{P} \)
(1) \( 30^{\circ} \)
(2) \( 45^{\circ} \)
(3) \( 60^{\circ} \)
(4) \( 15^{\circ} \)
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