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If f(x)+2f(1/x)=3x,x ne0 and S={x in R...

If `f(x)+2f(1/x)=3x,x ne0` and
`S={x in RR:f(x)=f(-x)},` then S

A

is an empty set

B

contains exactly one element

C

contains exactly two elements

D

contains more than two elements

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