If f (x) satisfies f (x) + 2F (1 / x) = 3x (x is not equal to 0), then f (x)=

f(x)+2f(1/x)=3x (1)
Let x = 1 / X
Then f (1 / x) + 2F (x) = 3 / X (2)
(2)×2-(1)
3f(x)=9/x-3x=3(3x²-1)/x
f(x0=(3x²-1)/x

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