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D( a )
a^2-1 = 0
a+1 = 0
a^2-1 = 0
a^2-1 = 0
1*a^2 = 1 // : 1
a^2 = 1
a^2 = 1 // ^ 1/2
abs(a) = 1
a = 1 or a = -1
a+1 = 0
a+1 = 0
a+1 = 0 // - 1
a = -1
a in (-oo:-1) U (-1:1) U (1:+oo)
(a^2)/(a^2-1)-(a/(a+1)) = 0
(a^2)/(a^2-1)+(-1*a)/(a+1) = 0
(a^2*(a+1))/((a^2-1)*(a+1))+(-1*a*(a^2-1))/((a^2-1)*(a+1)) = 0
a^2*(a+1)-1*a*(a^2-1) = 0
a^2+a = 0
a^2+a = 0
a*(a+1) = 0
a+1 = 0 // - 1
a = -1
a*(a+1) = 0
(a*(a+1))/((a^2-1)*(a+1)) = 0
(a*(a+1))/((a^2-1)*(a+1)) = 0 // * (a^2-1)*(a+1)
a*(a+1) = 0
( a+1 )
a+1 = 0 // - 1
a = -1
( a )
a = 0
a in { -1}
a = 0
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