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D( y )
y^1 = 0
y^1 = 0
y^1 = 0
y = 0
y in (-oo:0) U (0:+oo)
((((6*y^1)/4)^3)/(y^1))/12 = 0
((((6*y)/4)^3)/y)/12 = 0
9/32*y^2 = 0 // : 9/32
y^2 = 0
y = 0
y in { 0}
y belongs to the empty set
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