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æ¥åï¼ç®æµæ¯å离常æ°å解å¥å½æ°+1çæ ·åã
M+m=2
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f(x)=g(x)+1ï¼å
¶ä¸g(x)=(xcosx+sinx)/(cosx+2)
æç¥g(x)æ¯å¥å½æ°ï¼f(x)max=g(x)max+1ï¼f(x)min=g(x)min+1
g(x)max+g(x)min=0
æ以f(x)max+f(x)min=2
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