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2/(1+x^2) * (2x/(1+x^2) + (1-x^2)/(1+x^2) -2)/( (2x/(1-x^2))^2 - (2x/(1-x^2)) + 1 )
2/(1+x^2) * (2x/(1+x^2) + (1-x^2)/(1+x^2) -2)/( (2x/(1-x^2))^2 - (2x/(1-x^2)) + 1 )
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