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D( w )
w^2-1 = 0
w+1 = 0
w-1 = 0
w^2-1 = 0
w^2-1 = 0
1*w^2 = 1 // : 1
w^2 = 1
w^2 = 1 // ^ 1/2
abs(w) = 1
w = 1 or w = -1
w+1 = 0
w+1 = 0
w+1 = 0 // - 1
w = -1
w-1 = 0
w-1 = 0
w-1 = 0 // + 1
w = 1
w in (-oo:-1) U (-1:1) U (1:+oo)
2/(w+1)+(w+2)/(w^2-1)+1/(w-1) = 0
(2*(w^2-1)*(w-1))/((w+1)*(w^2-1)*(w-1))+((w+2)*(w+1)*(w-1))/((w+1)*(w^2-1)*(w-1))+(1*(w+1)*(w^2-1))/((w+1)*(w^2-1)*(w-1)) = 0
2*(w^2-1)*(w-1)+(w+2)*(w+1)*(w-1)+1*(w+1)*(w^2-1) = 0
3*w^3+w^3+w^2-3*w-w-1 = 0
4*w^3+w^2-4*w-1 = 0
4*w^3+w^2-4*w-1 = 0
4*w^3+w^2-4*w-1
4*w*(w^2-1)+w^2-1
(4*w+1)*(w^2-1)
((4*w+1)*(w^2-1))/((w+1)*(w^2-1)*(w-1)) = 0
((4*w+1)*(w^2-1))/((w+1)*(w^2-1)*(w-1)) = 0 // * (w+1)*(w^2-1)*(w-1)
(4*w+1)*(w^2-1) = 0
( 4*w+1 )
4*w+1 = 0 // - 1
4*w = -1 // : 4
w = -1/4
( w^2-1 )
1*w^2 = 1 // : 1
w^2 = 1
w^2 = 1 // ^ 1/2
abs(w) = 1
w = 1 or w = -1
w in { 1}
w in { -1}
w = -1/4
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