把下列各式约分.x的四次方-1/1-x²

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把下列各式约分.x的四次方-1/1-x²
把下列各式约分.x的四次方-1/1-x²

把下列各式约分.x的四次方-1/1-x²
(x^4-1)/(1-x^2)
=(x^2+1)(x^2-1)/(1-x^2)
=-(x^2+1)
=-x^2-1

(x^4-1)/(1-x^2)
=(x^2-1)(x^2+1)/(1-x^2)
=-(1-x^2)(x^2+1)/(1-x^2)
=-(x^2+1)
=-x^2-1