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ããããlim(nââ)(1/n)*â(1â¤kâ¤n)cos[(2k-1)Ï/(4n)]
ããã= lim(nââ)â(1â¤kâ¤n)cos[(Ï/2)(2k-1)/(2n)]*[(2k+1)/(2n)-(2k-1)/(2n)]
ããã= â«[0,1]cos[(Ï/2)x]dx
ããã= â¦â¦ï¼
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