设f(x)=在(一∞,+∞)内连续,则a=________.

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问题 设f(x)=在(一∞,+∞)内连续,则a=________.

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答案1

解析 f(0一0)= (sinx+cosx) =1.要使f(x)在(一∞,+∞)上连续,只需a=1=f(0)=a,即a=1.
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