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D( w )
3*w = 0
3*w = 0
3*w = 0
3*w = 0 // : 3
w = 0
w in (-oo:0) U (0:+oo)
2/(3*w)-(2*3*w^2) = 0
2/(3*w)-6*w^2 = 0
2/3*w^-1-6*w^2 = 0
2*w^-1*(1/3-3*w^3) = 0
-3*w^3 = -1/3 // : -3
w^3 = 1/9
w^3 = 1/9 // ^ 1/3
w = (1/9)^(1/3)
2/w = 0
2*w^-1 = 0 // : 2
w^-1 = 0
w naleu017Cy do O
w = (1/9)^(1/3)
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