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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
(y^-3)/2 = 125 // - 125
(y^-3)/2-125 = 0
1/2*y^-3 = 125 // : 1/2
y^-3 = 250
-3 < 0
1/(y^3) = 250 // * y^3
1 = 250*y^3 // : 250
1/250 = y^3
y^3 = 1/250 // ^ 1/3
y = (1/250)^(1/3)
y = (1/250)^(1/3)
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