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D( y )
9*y^(8/9) = 0
9*y^(8/9) = 0
9*y^(8/9) = 0
9*y^(8/9) = 0 // : 9
y^(8/9) = 0
y = 0
y in (-oo:0) U (0:+oo)
1/(9*y^(8/9)) = 0
1/9*y^(-8/9) = 0 // : 1/9
y^(-8/9) = 0
y należy do O
y belongs to the empty set
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