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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
(1/w+1)^2-(2*(1/w+1))-24 = 0
(1/w+1)^2-2*(1/w+1)-24 = 0
(w^-1+1)^2-2*(w^-1+1)-24 = 0
(w^-1+1)^2-2*(w^-1+1)-24 = 0
w^-2-24-1 = 0
w^-2-25 = 0
w^-2-25 = 0
1*w^-2 = 25 // : 1
w^-2 = 25
-2 < 0
1/(w^2) = 25 // * w^2
1 = 25*w^2 // : 25
1/25 = w^2
w^2 = 1/25 // ^ 1/2
abs(w) = 1/5
w = 1/5 or w = -1/5
w in { 1/5, -1/5 }
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