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