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D( y )
y^2 = 0
y^2 = 0
y^2 = 0
1*y^2 = 0 // : 1
y^2 = 0
y = 0
y in (-oo:0) U (0:+oo)
(1/4)*y-((1/6)*y) = 1/(y^2) // - 1/(y^2)
(1/4)*y-((1/6)*y)-(1/(y^2)) = 0
(1/4)*y+(-1/6)*y-y^-2 = 0
1/12*y-y^-2 = 0
y*(1/12-y^-3) = 0
-1*y^-3 = -1/12 // : -1
y^-3 = 1/12
-3 < 0
1/(y^3) = 1/12 // * y^3
1 = 1/12*y^3 // : 1/12
12 = y^3
y^3 = 12 // ^ 1/3
y = 12^(1/3)
y = 0
y = 0
y in { 0}
y = 12^(1/3)
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