CBSE 2024 · Region 3 · Set 1 · Q9 · 1 mark
If $\displaystyle \alpha, \beta$ and $\displaystyle \gamma$ are the angles which a line makes with positive directions of $\displaystyle \mathrm{x}, \mathrm{y}$ and z axes respectively, then which of the following is not true?
Official answer
From CBSE’s own marking scheme for this paper.
(D)
$\displaystyle \cos \alpha+\cos \beta+\cos \gamma=1$
Three Dimensional GeometryDirection Cosines and Direction Ratios of a LineUnderstandmcqmedium
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CBSE Class 12 Mathematics past-paper question from the 2024board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.