((x^2/ ((2*sqr(2))*(x^4+(x^2)*sqr(2)+1)))+ (1/ (2*(x^4+(x^2)*sqr(2)+1)))- (x^2/ ((2*sqr(2))*(x^4-(x^2)*sqr(2)+1)))+ (1/ (2*(x^4-(x^2)*sqr(2)+1))))dx

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