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D( y )
6*y^2 = 0
6*y^2 = 0
6*y^2 = 0
6*y^2 = 0 // : 6
y^2 = 0
y = 0
y in (-oo:0) U (0:+oo)
(6*y^2)^-1 = 1/18 // - 1/18
(6*y^2)^-1-(1/18) = 0
(6*y^2)^-1-1/18 = 0
1/6*y^-2 = 1/18 // : 1/6
y^-2 = 1/3
-2 < 0
1/(y^2) = 1/3 // * y^2
1 = 1/3*y^2 // : 1/3
3 = y^2
y^2 = 3 // ^ 1/2
abs(y) = 3^(1/2)
y = 3^(1/2) or y = -3^(1/2)
y in { 3^(1/2), -3^(1/2) }
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