MathematicsMedium110×since 2002Q3858If f(x)+2f(1x)=3x,x≠0f(x)+2 f\left(\frac{1}{x}\right)=3 x, x \neq 0f(x)+2f(x1)=3x,x=0, and S={x∈R:f(x)=f(−x)}\mathrm{S}=\{x \in \mathbf{R}: f(x)=f(-x)\}S={x∈R:f(x)=f(−x)}; then S:\mathrm{S}:S:Ais an empty set.Bcontains exactly one element.Ccontains exactly two elements.Dcontains more than two elements.Check answerSkip