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把x先提取出來,變成f(x)=x*lim(1-x^2n)/(1+x^2n) 極限裏面,分子分母同時除以x^2n然後在取極限,分子極限是-1,分母極限是1 所以,整個極限是-1/1=-1 則,再乘以極限外面的x f(x)=-x. 以上~
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