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D( y )
(6*y)^3 = 0
(6*y)^3 = 0
(6*y)^3 = 0
216*y^3 = 0 // : 216
y^3 = 0
y = 0
y in (-oo:0) U (0:+oo)
((3*y^2)^2)/((6*y)^3) = 0
1/24*y = 0 // : 1/24
y = 0
y in { 0}
y belongs to the empty set
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