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D( x )
x = 0
x^-16 = 0
x = 0
x = 0
x^-16 = 0
x^-16 = 0
1*x^-16 = 0 // : 1
x^-16 = 0
x należy do O
x in (-oo:0) U (0:+oo)
-((x^8)/(x^-16))^2 = 0
-1*x^48 = 0 // : -1
x^48 = 0
x = 0
x in { 0}
x belongs to the empty set
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