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\( \mathrm { f } ( \mathrm { x } ) + 2 \mathrm { f } \left( \frac { 1 } { \mathrm { x } } \right) = 3 \mathrm { x } , \mathrm { x } \neq 0 , \) and \( \mathrm { S } = \{ \mathrm { x } \in \mathrm { R }: \mathrm { f } ( \mathrm { x } ) = \mathrm { f } ( - \mathrm { x } ) \} ; \) then \( \mathrm { S } \) (1) contains exactly one element (3) contains more than two elements 12 ( 4 ) contains exactly two elements is an empty set
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