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D( x )
x^-4*((-6*x^3)/2) = 0
x = 0
x^-4*((-6*x^3)/2) = 0
x^-4*((-6*x^3)/2) = 0
-3*x^-1 = 0 // : -3
x^-1 = 0
x należy do O
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x^-4*((-6*x^3)/2))^-1 = 0
-1/3*x = 0 // : -1/3
x = 0
x in { 0}
x belongs to the empty set
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