设f’(x)连续,f(0)=0,f’(0)=1,则=_____________.

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问题 设f’(x)连续,f(0)=0,f’(0)=1,则=_____________.

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答案0

解析 -1~f2(x),
lncos(x-t)dt=-lncos(x-t)d(x-t)=-lncosudu=lncosudu,
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