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f(x)=lnx-ax,f'(x)=1/x-a, f'(x)=0 이면 x=1/a. 반면 x 는(0,1/a)에 속 할 때 f'(x)>0;x 는(1/a,+무한)에 속 할 때 f'(x)0,이때 0
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