CBSE 2025 · Region 4 · Set 2 · Q6 · 1 mark
If the direction cosines of a line are $\displaystyle \lambda, \lambda, \lambda$, then $\displaystyle \lambda$ is equal to :
Official answer
From CBSE’s own marking scheme for this paper.
(D)
$\displaystyle \pm \frac{1}{\sqrt{3}}$
Three Dimensional GeometryDirection Cosines and Direction Ratios of a LineApplymcqeasy
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CBSE Class 12 Mathematics past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.