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D( y )
5*y = 0
(5*y)^-2 = 0
5*y = 0
5*y = 0
5*y = 0 // : 5
y = 0
(5*y)^-2 = 0
(5*y)^-2 = 0
1/25*y^-2 = 0 // : 1/25
y^-2 = 0
y należy do O
y in (-oo:0) U (0:+oo)
(5*y^3)/((5*y)^-2) = 0
125*y^5 = 0 // : 125
y^5 = 0
y = 0
y in { 0}
y belongs to the empty set
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