1/X^2-1/(x*tanx)=(tanx-x)/(x^2*tanx)
tanxæ¯xççä»·æ ç©·å°(xè¶åäº0)
åå¼å¯å为
lim(xè¶åäº0)(tanx-x)/(x^3) åå¼ï¼åååæ¶æ±å¯¼
=lim(xè¶åäº0)[ï¼secx)^2-1]/(3*x^2) ï¼secx)^2-1=(tanx)^2
=lim(xè¶åäº0)[(tanx)^2]/(3*x^2) tanxæ¯xççä»·æ ç©·å°(xè¶åäº0)
=lim(xè¶åäº0)[x^2]/(3*x^2)
=1/3
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