`(1)/(4)LOG[(X^(2)-1)/(x^(2)+1)]+c``(1)/(4)log[(x^(2)+1)/(x^(2)-1)]+c``(1)/(2)log[(x^(2)-1)/(x^(2)+1)]+c``(1)/(2)log[(x^(2)+1)/(x^(2)-1)]+c`
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