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[" 20.Let "1=int(2)^(oo)((2x)/(x^(2)+1)-...

[" 20.Let "1=int_(2)^(oo)((2x)/(x^(2)+1)-(1)/(2x+1))dx" a lis a finite real number,then "],[[" (A) "lambda=(1)/(2)," (B) "x=1," (C) "1=(1)/(2)]]

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