Class CBSE Class 12 Mathematics Three Dimensional Geometry Q #1730
KNOWLEDGE BASED 1 Marks 2026 AISSCE(Board Exam) MCQ SINGLE
If $l_{1}$, $m_{1}$, $n_{1}$ and $l_{2}$, $m_{2}$, $n_{2}$ are direction cosines of lines $L_{1}$ and $L_{2}$ respectively and $\theta$ is the acute angle between them, then :
(A) $\cos\theta=l_{1}l_{2}+m_{1}m_{2}+n_{1}n_{2}$
(B) $\sin\theta=l_{1}l_{2}+m_{1}m_{2}+n_{1}n_{2}$
(C) $\tan\theta=\frac{l_{1}}{l_{2}}+\frac{m_{1}}{m_{2}}+\frac{n_{1}}{n_{2}}$
(D) $\cos\theta=|l_{1}l_{2}+m_{1}m_{2}+n_{1}n_{2}|$
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