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D( y )
y = 0
-6*y^-9 = 0
y = 0
y = 0
-6*y^-9 = 0
-6*y^-9 = 0
-6*y^-9 = 0 // : -6
y^-9 = 0
y należy do O
y in (-oo:0) U (0:+oo)
1/(-6*y^-9) = 0
-1/6*y^9 = 0 // : -1/6
y^9 = 0
y = 0
y in { 0}
y belongs to the empty set
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