设S(x)= 证明:当nπ≤x<(n+1)π时,2n≤S(x)<2(n+1);

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问题 设S(x)=
证明:当nπ≤x<(n+1)π时,2n≤S(x)<2(n+1);

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答案当nπ≤x<(n+1)π时,[*]

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