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