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limï¼xâ0ï¼[â«(0,x)sint^2dt]^2/â«(0,x)t^2sint^3dt
=limï¼xâ0ï¼2[â«(0,x)sint^2dt]*sinx^2/x^2sinx^3
=limï¼xâ0ï¼2[â«(0,x)sint^2dt]/sinx^3
=limï¼xâ0ï¼2[â«(0,x)sint^2dt]/x^3(æ ç©·å°ç价代æ¢ï¼
=limï¼xâ0ï¼2sinx^2/3x^2ï¼å次æ´å¿ è¾¾æ³åï¼
= 2/3.