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asumsikan y = 1
f(x) = f(x - 1)
f(x - 1) = f(x - 2)
...dst...
Dari persamaan diatas, jika y = 1 maka untuk sebarang bilangan m dan n pasti memenuhi f(m) = f(n).
Jadi, f(6) = 1
f(-2) = 1
f(4) = 1
f(-2) - f(4) = 0
Semoga membantu