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2log x-log(x+1)-log(x-1) is equals to
A. `x^(2)+1/2x^(4)+1/3x^(6)`+..
B. `(1)/(x^(2))+(1)/(2x^(4))+(1)/(3x^(6))`+..
C. `-{(1)/(x^(2))+(1)/(2x^(4))+(1)/(3x^(6))`+..
D. `-(1)/(n)(w)^(n)+w^(2n)`

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