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D( y )
y = 0
y^(-4/3) = 0
y = 0
y = 0
y^(-4/3) = 0
y^(-4/3) = 0
1*y^(-4/3) = 0 // : 1
y^(-4/3) = 0
y należy do O
y in (-oo:0) U (0:+oo)
(y^(-5/9))/(y^(-4/3)) = 0
1*y^(7/9) = 0 // : 1
y^(7/9) = 0
y = 0
y in { 0}
y belongs to the empty set
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