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D( w )
w^2 = 0
w^2 = 0
w^2 = 0
1*w^2 = 0 // : 1
w^2 = 0
w = 0
w in (-oo:0) U (0:+oo)
(2*w^3-4800)/(w^2) = 0
2*w^3 = 4800 // : 2
w^3 = 2400
w^3 = 2400 // ^ 1/3
w = 2*300^(1/3)
w = 2*300^(1/3)
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