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