lim_{h→0}{{f(a+h)-f(a)}/h=f\'(a) lim_{h→0}h=0 lim{f(a+h)-f(a)}=f\'(a)·0=0 lim_{h→0}f(a)=f(a) lim_{h→0}f(a+h)=0+f(a)=f(a) 미분가능하면연속입니다
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