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Let f(x)={(xsin(1/x), whenx!=0),(1, when...

Let `f(x)={(xsin(1/x), whenx!=0),(1, when x=0):}` and `A={x inR:f(x)=1}`. Then A has

A

exactly one element

B

exactly two elements

C

exactly three elements

D

infinitely many elements

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KVPY PREVIOUS YEAR-SOLVED PAPER 2019-EXAMPLE
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