ãã解ï¼è®¾t=x-h+yï¼ådt=dyï¼yâ[02h]ã
ããâ´åå¼=lim(hâ0)(1/h)â«(0,2h)cos[(x-h+y)^2]dyãå±â0/0âåï¼ç¨æ´å¿
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ããâ´åå¼=lim(hâ0)(1/h)â«(0,2h)cos[(x-h+y)^2]dy=2lim(hâ0)cos[(x-h+2h)^2]=2cos(x^2)ãä¾åèã
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