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[" 18.If "f(x)=x-x^(2)+x^(3)-x^(4)+........

[" 18.If "f(x)=x-x^(2)+x^(3)-x^(4)+......oo" when "|x|<1" then "f^(-1)(x)=],[[" 1) "(x)/(1-x)," 2) "(x)/(1+x)," 3) "(1)/(1-x)," 4) "(1)/(1+x)]]

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