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Let S ={x in R: cos(x)+cos(sqrt(2)x)lt2}...

Let S `={x in R: cos(x)+cos(sqrt(2)x)lt2}`. Then

A

`S=phi`

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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KVPY PREVIOUS YEAR-SOLVED PAPER 2018-EXAMPLE
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