f(x)å¨x=0å¤è¿ç» åªè¦lim(xâ0)f(x)=f(0)å³å¯
â´lim(xâ0+) (e^(ax)+x�0�5-ax-1)/xsin(x/4)=6
lim(xâ0-) ln(1+ax�0�6)/(x-arcsinx)=6
â å½xï¼0æ¶sin(x/4)~x/4(çä»·æ ç©·å°)åæ¯xsin(x/4)å¯ä»£æ¢ä¸ºx^2/4 ååe^(ax)ç±æ³°åå±å¼å¾ï¼e^(ax)=1+ax+(a^2/2)x^2+o(x^2)
å³x^2+(a^2/2)x^2+o(x^2)
åååæ¯åæ¶Ã·x�0�5å¾ï¼lim(xâ0+) (e^(ax)+x�0�5-ax-1)/xsin(x/4)=2a�0�5+4
â´2a�0�5+4=6解å¾ï¼a=1æa=-1 â¡å½xï¼0æ¶ln(1+ax^3)~ax^3
å³lim ln(1+ax�0�6)/(x-arcsinx)=lim ax�0�6/(x-arcsinx)ç±æ´å¿
è¾¾æ³åæ±æéï¼å¾ï¼lim ax�0�6/(x-arcsinx)=lim3ax�0�5/[1- 1/â(1-x�0�5)]æ´çï¼å¾ï¼lim [3ax�0�5 Ãâ(1-x�0�5)]/[â(1-x�0�5) -1]
åååæ¯åæ¶Ã[â(1-x�0�5) +1]ååæ¶Ã·x�0�5 ï¼å¾ï¼lim ln(1+ax�0�6)/(x-arcsinx)=-6a=6â´a=-1
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