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D( y )
12*y^3 = 0
12*y^3 = 0
12*y^3 = 0
12*y^3 = 0 // : 12
y^3 = 0
y = 0
y in (-oo:0) U (0:+oo)
(24*y^7)/(12*y^3) = 0
2*y^4 = 0 // : 2
y^4 = 0
y = 0
y in { 0}
y belongs to the empty set
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