If \( f(x)+2 f\left(\frac{1}{x}\right)=3 x, x \neq 0 \) and
P \( S=... VIDEO
If \( f(x)+2 f\left(\frac{1}{x}\right)=3 x, x \neq 0 \) and
P \( S=\{x \in R: f(x)=f(-x)\} ; \) then \( \mathrm{S}: \)
W
[JEE Main-2016]
(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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