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D( y )
y = 0
(y^-1)/5 = 0
y = 0
y = 0
(y^-1)/5 = 0
(y^-1)/5 = 0
1/5*y^-1 = 0 // : 1/5
y^-1 = 0
y należy do O
y in (-oo:0) U (0:+oo)
((((-y)^3)/4)/((y^-1)/5))^5 = 0
-3125/1024*y^20 = 0 // : -3125/1024
y^20 = 0
y = 0
y in { 0}
y belongs to the empty set
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