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D( x )
x < 0
x = 0
(x^(-5/6))^2 = 0
x < 0
x = 0
x = 0
(x^(-5/6))^2 = 0
(x^(-5/6))^2 = 0
1*x^(-5/3) = 0 // : 1
x^(-5/3) = 0
x należy do O
x in (0:+oo)
(x^(-3/5)*x^(2/3))/((x^(-5/6))^2) = 0
1*x^(26/15) = 0 // : 1
x^(26/15) = 0
x = 0
x in { 0}
x belongs to the empty set
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