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D( a )
a = 0
a^-1+1 = 0
a = 0
a = 0
a^-1+1 = 0
a^-1+1 = 0
1*a^-1 = -1 // : 1
a^-1 = -1
-1 < 0
1/(a^1) = -1 // * a^1
1 = -1*a^1 // : -1
-1 = a^1
a = -1
a in (-oo:-1) U (-1:0) U (0:+oo)
(1-(2*a^-1)-(3*a^-2))/(a^-1+1) = 0
(1-2*a^-1-3*a^-2)/(a^-1+1) = 0
1-2*a^-1-3*a^-2 = 0
1*a^0-2*a^-1-3*a^-2 = 0
(1*a^2-2*a^1-3*a^0)/(a^2) = 0 // * a^4
a^2*(1*a^2-2*a^1-3*a^0) = 0
a^2
a^2-2*a-3 = 0
a^2-2*a-3 = 0
DELTA = (-2)^2-(-3*1*4)
DELTA = 16
DELTA > 0
a = (16^(1/2)+2)/(1*2) or a = (2-16^(1/2))/(1*2)
a = 3 or a = -1
a in { -1, 3}
(a+1)*(a-3) = 0
((a+1)*(a-3))/(a^-1+1) = 0
( a+1 )
a+1 = 0 // - 1
a = -1
( a-3 )
a-3 = 0 // + 3
a = 3
a in { -1}
a = 3
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