lim(xâ0-)f(x)
=lim(xâ0-)sin2x/x
=lim(xâ0-)2sin2x/2x
=2
lim(xâ0+)f(x)
=lim(xâ0+)ln(1+2x)/x
=lim(xâ0+)2x/x
=2
æ以lim(xâ0)f(x)=2
æ以è¦ä½¿å¾å½æ°å¨x=0å¤è¿ç»ï¼é£ä¹lim(xâ0)f(x)=f(0)=k=2
æ以k=2
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