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D( y )
(8*y)^2 = 0
(8*y)^2 = 0
(8*y)^2 = 0
64*y^2 = 0 // : 64
y^2 = 0
y = 0
y in (-oo:0) U (0:+oo)
((2*y)^3*y^4)/((8*y)^2) = 0
1/8*y^5 = 0 // : 1/8
y^5 = 0
y = 0
y in { 0}
y belongs to the empty set
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