Let f (x) be defined on (- ∞, 0) ∪ (0, + ∞), and f (x) satisfy the relation f (x) + 2F (1 / x) = 3x
From the known f (x) + 2F (1 / x) = 3x, (1)
Because x is not equal to 0, then replace x with 1 / x, then f (1 / x) + 2F (x) = 3 / x, (2)
(1) - 2 * (2) gives - 3f (x) = 3x-6 / X,
So f (x) = (2 / x) - X
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