高等数学求极限和不定积分,高悬赏?
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高等数学,求极限,不定积分。求详细解答答:∫<0,π>|sint|dt=-cost|<0,π>=2,∫<π,2π>|sint|dt=cost|<π,2π>=2,……设kπ≤x<(k+1)π,k∈N,则 2k≤∫<0,x>|sint|dt<2(k+1),∴2k/[(k+1)π]≤∫<0,x>|sint|dt/x<2(k+1)/(kπ),∴x→+∞时k→+∞,2/π≤∫<0,x>|sint|dt/x≤2/π,∴...