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