åæ¹ç¨å¯å为lnx-x/e+Ï=0
令f(x)=lnx-x/e+Ï
æ以f'(x)=1/x-e/x å¨åºé´ï¼e,e 3次æ¹ï¼ä¸æå°äºï¼ï¼ä¸ºåå½æ°ã
æ以f(x)æå°å¼ä¸ºf(e3)=3-e2+Ï <0 æ大å¼ä¸ºf(e)=1-1+Ï >0
æ以æ¹ç¨lnx=x/e-â«ç±0å°Ï æ ¹å·ä¸1-cos2x dxå¨åºé´ï¼e,e 3次æ¹ï¼æå¯ä¸å®æ°æ ¹
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