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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
3*w^(-4/5) = 1/2 // - 1/2
3*w^(-4/5)-(1/2) = 0
3*w^(-4/5)-1/2 = 0
3*w^(-4/5) = 1/2 // : 3
w^(-4/5) = 1/6
-4/5 < 0
1/(w^(4/5)) = 1/6 // * w^(4/5)
1 = 1/6*w^(4/5) // : 1/6
6 = w^(4/5)
w^(4/5) = 6 // ^ 5
w^4 = 7776 // ^ 1/4
abs(w) = 6*6^(1/4)
w = 6*6^(1/4) or w = -(6*6^(1/4))
w in { 6*6^(1/4), -(6*6^(1/4)) }
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