If f(x) +2f(1/x) =3x, x ne 0 and S={x in...

If `f(x) +2f(1/x) =3x, x ne 0` and `S={x in R//f (x) =f(-x)}`, then S is:

A

contains exactly one element

B

contains exactly two element

C

contain more than two element

D

is an empty set

Verified by Experts

The correct Answer is:

B

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