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D( a )
a-1 = 0
a^2-1 = 0
a-1 = 0
a-1 = 0
a-1 = 0 // + 1
a = 1
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 in (-oo:-1) U (-1:1) U (1:+oo)
a/(a-1)-(2/(a^2-1)) = 0
a/(a-1)-2*(a^2-1)^-1 = 0
a/(a-1)-2/(a^2-1) = 0
(a*(a^2-1))/((a-1)*(a^2-1))+(-2*(a-1))/((a-1)*(a^2-1)) = 0
a*(a^2-1)-2*(a-1) = 0
a^3-3*a+2 = 0
a^3-3*a+2 = 0
a^3-3*a+2 = 0
{ 1, -1, 2, -2 }
1
a = 1
a^3-3*a+2 = 0
1
a-1
a^2+a-2
a^3-3*a+2
a-1
a^2-a^3
a^2-3*a+2
a-a^2
2-2*a
2*a-2
0
a^2+a-2 = 0
DELTA = 1^2-(-2*1*4)
DELTA = 9
DELTA > 0
a = (9^(1/2)-1)/(1*2) or a = (-9^(1/2)-1)/(1*2)
a = 1 or a = -2
a in { -2, 1, 1}
(a+2)*(a-1)^2 = 0
((a+2)*(a-1)^2)/((a-1)*(a^2-1)) = 0
((a+2)*(a-1)^2)/((a-1)*(a^2-1)) = 0 // * (a-1)*(a^2-1)
(a+2)*(a-1)^2 = 0
( a+2 )
a+2 = 0 // - 2
a = -2
( a-1 )
a-1 = 0 // + 1
a = 1
a in { 1}
a = -2
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