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ã ãf(x) = x²sin(1/x)ï¼xâ 0ï¼
ãããã= 0ï¼x=0ï¼
æ
ããf'(x) = 2xsin(1/x)-cos(1/x)ï¼xâ 0ï¼
ãããã= 0ï¼x=0ï¼
ï¼å
¶ä¸f'(0) åºå©ç¨å¯¼æ°å®ä¹è®¡ç®ï¼ï¼æ³¨æ f'(x) å¨ x=0 å¤æ¯ä¸è¿ç»çã
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