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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)
(9*y^5)/(6*y^2) = 0
3/2*y^3 = 0 // : 3/2
y^3 = 0
y = 0
y in { 0}
y belongs to the empty set
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