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D( w )
w^2.5 = 0
w < 0
w^2.5 = 0
w^2.5 = 0
1*w^2.5 = 0 // : 1
w^2.5 = 0
w = 0
w < 0
w in (0:+oo)
4/(w^2.5) = 0.5 // - 0.5
4/(w^2.5)-0.5 = 0
4*w^-2.5 = 0.5 // : 4
w^-2.5 = 0.125
-2.5 < 0
1/(w^2.5) = 0.125 // * w^2.5
1 = 0.125*w^2.5 // : 0.125
8 = w^2.5
w^2 = 8^(1/0.5) // ^ 1/2
abs(w) = 8
w = 8 or w = -8
w in { -8}
w = 8
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