Question:
Mark $(\sqrt{ })$ against the correct answer in the following:
$f(\mathrm{x})=\sin \mathrm{x}-\mathrm{kx}$ is decreasing for all $\mathrm{x} \notin \mathrm{R}$, when
A. $k<1$
B. $k \leq 1$
C. $k>1$
D. $\mathrm{k} \leq 1$
Solution:
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