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