(a-b) ^-2 * (a^-2 -b^-2 )

Question

(a-b) ^-2 * (a^-2 -b^-2 )

Answer 1

X^(-1)=1/x
(1/(a-b)²)*(1/(a²-b²)=
1/(a-b)²*(a²-b²)

Answer 2

1/(a-b)^2*[(1/a^2)-(1/b^2)]=1/(a-b)^2*(b^2-a^2)/(a^2b^2)=1/(a-b)^2*(-(a^2-b^2))/(a^2b^2)=-(a+b)/[(a-b)*a^2b^2]=-(a+b)/(a^3b^2-a^2b^3)

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