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D( x )
(x+1)^2 = 0
(x+1)^2 = 0
(x+1)^2 = 0
x+1 = 0 // - 1
x = -1
x in (-oo:-1) U (-1:+oo)
1-(1/((x+1)^2)) = 0
1-(x+1)^-2 = 0
1-1/((x+1)^2) = 0
(1*(x+1)^2)/((x+1)^2)-1/((x+1)^2) = 0
1*(x+1)^2-1 = 0
x^2+2*x = 0
x^2+2*x = 0
x*(x+2) = 0
x+2 = 0 // - 2
x = -2
x*(x+2) = 0
(x*(x+2))/((x+1)^2) = 0
(x*(x+2))/((x+1)^2) = 0 // * (x+1)^2
x*(x+2) = 0
( x+2 )
x+2 = 0 // - 2
x = -2
( x )
x = 0
x in { -2, 0 }
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