(2(x^2-1)-2x · 2x)/(x^2-1)^2怎么算出-2(1+x^2)/(1-x^2)^2
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(2(x^2-1)-2x · 2x)/(x^2-1)^2怎么算出-2(1+x^2)/(1-x^2)^2
(2(x^2-1)-2x · 2x)/(x^2-1)^2怎么算出-2(1+x^2)/(1-x^2)^2
(2(x^2-1)-2x · 2x)/(x^2-1)^2怎么算出-2(1+x^2)/(1-x^2)^2
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