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[" 34.If "int(e^(x)-1)/(e^(x)+1)dx=f(x)+...

[" 34.If "int(e^(x)-1)/(e^(x)+1)dx=f(x)+c" then "f(x)=],[[" I) "2log(e^(x)+1)," 2) "log(e^(2x)-1)," 3) "2log(e^(x)+1)-x," 4) "log(e^(2x)+1)]]

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