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