The angle between two lines whose direction cosines satisfy the equ...

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The angle between two lines whose direction cosines satisfy the equations \( n=\mid+m \) and \( m=2 \mid+ \) \( 3 \mathrm{n} \) is
\( \mathrm{P} \)
(a) \( 0^{\circ} \)
(b) \( 90^{\circ} \)
(c) \( 60^{\circ} \)
(d) none of these
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