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f(1/x) + 1/x f(-x) = 2x
untuk x = -2, maka f(-1/2) - 1/2 f(2) = 2(-2) atau
f(-1/2) - 1/2 f(2) = -4
kedua ruas dikali 2, get
2f(-1/2) - f(2) = -8 .... (1)
untuk x = 1/2, maka f(2) + 2 f(-1/2) = 2(1/2) atau
f(2) + 2 f(-1/2) = 1 .... (2)
eliminasi,
2f(-1/2) - f(2) = -8
f(2) + 2 f(-1/2) = 1
-------------------------- (-)
- 2 f(2) = -9
f(2) = 9/2