Let $S=\{x \in R: \cos (x)+\cos (\sqrt{2} x)<2\}$, then
Let $S=\{x \in R: \cos (x)+\cos (\sqrt{2} x)<2\}$, then
- [KVPY 2018]
- A
$S=\emptyset$
- B
$S$ is a non-empty finite set
- C
$S$ is an infinite proper subset of $R-\{0\}$
- D
$S=R-\{0\}$
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