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D( y )
y^3 = 0
(y^4)^3 = 0
y^3 = 0
y^3 = 0
1*y^3 = 0 // : 1
y^3 = 0
y = 0
(y^4)^3 = 0
(y^4)^3 = 0
1*y^12 = 0 // : 1
y^12 = 0
y = 0
y in (-oo:0) U (0:+oo)
(y^3)^0*((2*3*y^2*y^3)/((y^4)^3)) = 0
(2*3*y^2*y^3)/((y^4)^3) = 0
6*y^-7 = 0 // : 6
y^-7 = 0
y należy do O
y belongs to the empty set
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