[微積] 證明難題想了三天了
假設f(x):[0,1]-> R 可微分
f(0)=0,且f(x)>0,對所有X屬於(0,1)
證明存在c屬於(0,1)
使得 2f'(c) / f(c) = f'(1-c) /f(1-c)
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