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[int(1)/(x^(4)-1)dx=.........+c=...........

[int(1)/(x^(4)-1)dx=.........+c=.............],[[" (A) "(1)/(2)log|(x-1)/(x+1)|-tan^(-1)x," (B) "(1)/(4)log|(x-1)/(x+1)|+(1)/(2)tan^(-1)x],[" C) "(1)/(4)log|(x-1)/(x+1)|-(1)/(2)tan^(-1)x," (D) "(1)/(4)tan^(-1)x-(1)/(2)log|(x-1)/(x+1)|]]

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