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證:f(x+2)=[1+f(x+1)]/[1-f(x+1)] 將f(x+1)=(1+f(x))/(1-f(x))代入化簡得 f(x+2)=-1/f(x) 所以f(x+4)=-1/f(x+2)=f(x) 所以4是f(x)的一個週期
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