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Mathematics · 2023 · 1 mark
CBSE 2023 · Region 1 · Set 1 · Q16
If f ( x )= a ( x - cos x ) is strictly decreasing in R, then ' a ' belongs to
If $\displaystyle \mathrm{f}(\mathrm{x})=\mathrm{a}(\mathrm{x}-\cos \mathrm{x})$ is strictly decreasing in $\displaystyle \mathbb{R}$, then ' a ' belongs to
Official answer
(C)
$\displaystyle (-\infty, 0)$
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