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Mathematics · 2024 · 1 mark
CBSE 2024 · Region 3 · Set 1 · Q9
If α, β and γ are the angles which a line makes with positive directions of x, y and z axes respectively, then which of the following is not true?
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
(D)
$\displaystyle \cos \alpha+\cos \beta+\cos \gamma=1$
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