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D( x )
(x^-1)/6 = 0
x = 0
(x^-1)/6 = 0
(x^-1)/6 = 0
1/6*x^-1 = 0 // : 1/6
x^-1 = 0
x należy do O
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(((-3*x^2)/3)^5)/((x^-1)/6) = 0
-6*x^11 = 0 // : -6
x^11 = 0
x = 0
x in { 0}
x belongs to the empty set
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