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設X〈0,則-X>0 所以F(-X)=1 因F(X)是奇函數 所F(X)=-F(-X)=-1 當Lim f(X)=1 X→0+ Lim f(X)=-1 X→0- 所以f(x)在0處無意義 所以y=f(x)={1 X>0 { -1 X
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